Open Access Articles- Top Results for 4-8-4


Under the Whyte notation for the classification of steam locomotives, 4-8-4 represents the wheel arrangement of four leading wheels on two axles, usually in a leading truck, eight powered and coupled driving wheels on four axles, and four trailing wheels on two axles, usually in a trailing truck. The type was first used by the Northern Pacific Railway and is consequently most commonly known as a Northern.

Other equivalent classifications are:



The 4-8-4 wheel arrangement was an obvious progression from the 4-8-2 Mountain type and, like the 2-8-4 Berkshire and 4-6-4 Hudson types, an example of the "Super Power" concept in steam locomotive design that made use of the larger firebox that could be supported by the four-wheel trailing truck, which allowed improved free steaming, particularly at speed. This was combined with the stability at speed brought about by the four-wheel leading truck and the greater adhesion of the eight-coupled driving wheels.

The evolution to the 4-8-4 type occurred in the United States of America soon after the Lima Locomotive Works introduced the concept of "Lima Super Power" in 1925. The prototype was built to Super Power principles by American Locomotive Company (ALCO) for the Northern Pacific Railway (NP) in 1926, with a four-wheel trailing truck to carry the weight of a very large firebox that was designed to burn low quality lignite coal. The potential benefit of supporting a firebox with a Script error: No such module "convert". grate on a four-wheel trailing truck was quickly realised by locomotive designers since, given the truck’s additional weight of approximately Script error: No such module "convert". and the Script error: No such module "convert". of additional engine weight that a four-wheel truck could carry above that of a two-wheel truck, the difference of Script error: No such module "convert". was available to be used for increased boiler capacity.[1]:308–309

The 4-8-4 type arrived on the locomotive scene at a time when nearly all the important design improvements had already been proven, such as the superheater, mechanical stoker, outside valve gear, the Delta trailing truck and the one-piece bed frame of cast steel with integrally cast cylinders, which did much to advance the application of roller bearings on steam locomotives since it gave the strength and rigidity to hold them in correct alignment. In 1930 the Timken Company actually used a 4-8-4, built by ALCO, with roller bearings on all axles and called the Timken 1111, to demonstrate the value of their sealed roller bearings over nearly every mainline in the United States. The Timken 1111 was subsequently sold to the NP, where it became their sole class A-1.[1]:308–309

The stability of the 4-8-4 wheel arrangement enabled it to be provided with driving wheels of up to Script error: No such module "convert". diameter for high speed passenger and fast freight operation and, with the latest lateral control devices, the type was flexible on curves in spite of its eight-coupled drivers. The increased boiler size that became possible with this type, together with the high axle loads permitted on mainlines in North America, resulted in the design of some massive locomotives with all-up weights exceeding 350 tons with tender included. The 4-8-4 proved itself suitable for both express passenger and fast freight service. While it was not suited to heavy drag freight trains, faster and lighter trains were well suited to the type.[1]:308–309

Although locomotives of the 4-8-4 wheel arrangement were used in a number of countries, those that were developed outside North America included various design features which set them apart from North American practice. The United States, Canada and Mexico were the domains of the North American 4-8-4, and scaled down examples of the type were exported by two American builders, ALCO and Baldwin Locomotive Works, for 1,000 mm (3 ft 3 38 in) metre gauge lines in Brazil. Most were two-cylinder locomotives, but four classes of three-cylinder 4-8-4s were built: the 06 class by the Deutsche Reichsbahn in Germany, the H class by the Victorian Railways in Australia; and two compound 4-8-4s: the 242A1 class of the Société Nationale des Chemins de fer Français (SNCF) in France and an experimental high pressure locomotive of the New York Central (NYC).

The Northern name

Since the 4-8-4 was first used by the Northern Pacific Railway, the type was named "Northern". Most North American railroads used this name, but some adopted different names.

The Richmond, Fredericksburg and Potomac Railroad (RFP) gave each of its three 4-8-4 classes a separate name, the "General" of 1937, the "Governor" of 1938 and the "Statesman" of 1944.


The big wheeled 4-8-4 was at home on heavy passenger trains and quite capable of speeds over Script error: No such module "convert"., but freight was the bread and butter of the railroads and in that service the Northern had limitations. The adhesive weight on a 4-8-4 was limited to about 60% of the engine's weight, not including the dead weight of the tender. Henry Bowen, the Chief Mechanical Engineer of the Canadian Pacific Railway (CPR) from 1928 to 1949, recognized this and after testing the first two CPR K-1a Northerns introduced by his predecessor, he designed a 2-10-4 Selkirk using the same boiler. The resulting T-1a Selkirk locomotive had the same number of axles as the Northern, but the driving wheels were reduced from Script error: No such module "convert". in diameter, while the additional pair of driving wheels increased the tractive effort by 27%. In a later variant, Bowen added a booster to the trailing truck, enabling the big Selkirk to exert nearly 50% more tractive effort than the similar sized K-1a Northern.

However, when it was demonstrated that a three-unit EMD F3 diesel electric consist that weighed a little less than the total engine and tender mass of a CPR K-1a Northern could produce nearly three times its tractive effort, even new Super Power steam locomotives were retired as quickly as finance allowed.



A total of twenty-three 4-8-4 locomotives operated in Australia, built to three distinct designs.

In 1929 the ten 5 ft 3 in (1,600 mm) South Australian Railways 500 class 4-8-2 Mountains of 1926 were equipped with steam boosters, in the form of small auxiliary steam engines, in order to increase their power. This necessitated the replacement of their two-wheel trailing trucks with four-wheel trucks. The booster contributed an additional Script error: No such module "convert". to the tractive effort and permitted an increase in the locomotive’s load across the Mount Lofty Ranges to 540 tons. In their new 4-8-4 configuration, they were reclassified to 500B class.[2]

File:520 class loco-South Australia-1984.jpg
South Australian Railways 520 class

In 1943 the first of twelve streamlined South Australian Railways 520 class locomotives were delivered from the Islington Workshops in Adelaide. Although they were large locomotives, they were designed to run on lightly constructed Script error: No such module "convert". track, with the engine's weight being spread over eight axles. Their Script error: No such module "convert". diameter driving wheels were specially balanced for Script error: No such module "convert". running.[3]

The H class three-cylinder 4-8-4 of the Victorian Railways, built in 1941, was designed for heavy passenger work on the line between Melbourne and Adelaide. Nicknamed "Heavy Harry", it was the largest and most powerful non-articulated steam locomotive built in Australia and was one of the four known classes of three-cylinder 4-8-4 locomotives. Construction of three locomotives commenced at the Newport Workshops in 1939 and three sets of frames were manufactured. Although work was halted due to the outbreak of World War II, a shortage of motive power caused by increased wartime traffic resulted in authorisation being given for the completion of class leader H220. The locomotive went into service on 7 February 1941, but remained the sole member of the class since the other two partly built locomotives were never completed. Since the necessary upgrades to the Adelaide line was deferred, the H class operated only on the line between Melbourne and Albury in New South Wales.[4][5]


In order to meet the acute locomotive shortages in Brazil after World War II, twenty-seven scaled down American 4-8-4 Niágara locomotives were ordered by the Brazilian Departamento Nacional de Estradas de Ferro (DNEF) from the American Locomotive Company (ALCO) in 1946. These locomotives were supplied to the Viação Férrea do Rio Grande do Sul (VFRGS), which then purchased another fifteen directly from ALCO in 1947. They were designated the 1001 class. In 1956 and 1957 some of them were sold to Bolivia. The Baldwin Locomotive Works supplied similar 1,000 mm (3 ft 3 38 in) metre gauge 4-8-4 locomotives to the Rede Mineira de Viação (RMV no. 601 to 604), the Rede de Viação Paraná-Santa Catarina (RVPSC no. 801 to 806) and the Noroeste do Brasil (NOB no. 621 to 623).[6]

After his retirement from the Société Nationale des Chemins de fer Français (SNCF) in France, French engineer André Chapelon was appointed as the chief designer of 1,000 mm (3 ft 3 38 in) metre gauge 4-8-4 locomotives at the French state-owned sales consortium Groupement d´Exportation de Locomotives en Sud-Amérique (GELSA). In 1949 a contract was signed between DNEF and GELSA for the construction of twenty-four 4-8-4 locomotives with a Script error: No such module "convert". axle load. The order also included sixty-six 2-8-4 Berkshires, and all ninety locomotives were delivered by January 1953.

The twenty-four class 242F Niágara locomotives were built by Société de Construction des Batignolles (Batignolles-Châtillon). They were two cylinder simple expansion locomotives, designed to burn poor quality local coal with a low calorific thermal value, with driving wheels of Script error: No such module "convert". diameter and a grate area of Script error: No such module "convert".. They were coupled to big tenders which a capacity of Script error: No such module "convert". of coal. The Belpaire firebox included a combustion chamber and the boiler pressure was a high Script error: No such module "convert".. One member of the class was tested on the 1,000 mm (3 ft 3 38 in) metre gauge Reseau Breton line in France before being shipped to Brazil.[7]

The DNEF allocated the locomotives to four of Brazil's state railways. In Brazilian railway conditions, these modern locomotives were not popular with local railwaymen and were not used as much as had been hoped. Their maximum axle load of Script error: No such module "convert". restricted their usefulness, as did their long tenders. In some places the turntables were too short to turn the locomotives and they had to be turned on triangles. In addition, the building specifications had called for a locomotive capable of a maximum speed of Script error: No such module "convert". and the ability to negotiate curves with a minimum radius of Script error: No such module "convert".. This last point proved to be a source of contention when it was later discovered that the curves in some places were of less than Script error: No such module "convert". radius. As a consequence the locomotives were involved in a number of derailments.

In the late 1960s they were relegated down from first class passenger trains. Some locomotives, allocated to Southern Brazil, were also tried in Bolivia.


Since the Canadian mainlines were generally laid with Script error: No such module "convert". rail, Canadian 4-8-4s were heavy and weighed in with axle loads up to 31.3 short tons.

When the Canadian National Railway (CN) introduced its first 4-8-4 in 1927, it used the name "Confederation" for the type to celebrate the 60th anniversary of the Canadian Confederation. The CN employed a total of one hundred and sixty Confederation locomotives.

  • Altogether forty locomotives were delivered in 1927, twenty Class U-2-a from the Canadian Locomotive Company and twenty Class U-2-b from the Montreal Locomotive Works (MLW).
  • Another twenty Class U-2-c came from MLW in 1929 and another five Class U-2-d, also from MLW, in 1936.
  • The CN U-4a was one of the few streamlined Confederation types, with five locomotives built by MLW and also introduced in 1936. U-4a no. 6400 achieved fame in 1939 by heading the Royal Train and being exhibited at the New York World's Fair in the same year.
  • Between 1940 and 1944 a total of ninety more Confederation locomotives, built in four batches, were added to the CN roster.[8]

The Canadian Pacific Railway (CPR) experimented with the 4-8-4 wheel arrangement in 1928, when two K-1a class locomotives were built in its Angus shops in Montreal, the first locomotives to be built with a one piece cast steel frame in Canada. However, since the CPR mainlines were built to high standards, the railway preferred to develop the 4-6-4 Hudson type for passenger work since it gave adequate power and was cheaper to maintain, while a ten-coupled type, the 2-10-4 Selkirk, was adopted for heavy-duty work. Nevertheless, although the two CPR Northerns remained orphans, they proved their worth continuously for 25 years on overnight passenger trains between Montreal and Toronto. Before their retirement in 1960, they were converted to oil-burners and worked freight trains in the prairie provinces.[9][10]


In 1936 the German builder Henschel & Son supplied ten 5 ft 6 in (1,676 mm) 4-8-4 locomotives to the Ferrocarriles del Estado (State Railways or FdE) of Chile, designated the Tipo 100. They were called Super Montañas (Super Mountains), since they followed the Tipo 80 4-8-2 Mountain that was introduced six years earlier. They were equipped with mechanical stokers and Vanderbilt tenders and weighed 185 tonnes in working order. On test they produced Script error: No such module "convert". at a coal consumption of Script error: No such module "convert". and a water consumption of Script error: No such module "convert". per kilometre. The design was not repeated, however, and the FdE returned to the 4-8-2 wheel arrangement with subsequent acquisitions. The Tipo 100 was used on the line from Almeda to Talca until it was replaced by diesels in 1969. One of them, no. 1009, is preserved in the Santiago Railway Museum.[11]


In 1933 the Beijing–Hankou Railway in China needed new locomotives for their Guangzhou to Shaoguan line, where gradients of around two percent, curves with less than Script error: No such module "convert". radius and low capacity bridges existed. The requirement was therefore for a locomotive with high tractive effort and a low axle load. Twenty-four 600 series 4-8-4 locomotives, designed and built in the United Kingdom by Vulcan Foundry, were delivered to the railway in 1935 and 1936. The locomotives represented a significant improvement over previous designs and incorporated a more efficient E-type superheater and duplex steam valve to allow better steaming without enlarging the boiler, while the 4-8-4 wheel arrangement allowed better weight distribution.

When the Changsha-Guangzhou Railway was completed in October 1936, the locomotives were transferred to operate over the northern section between Hankou and Changsha on this new mainline that connected Guangzhou with Tianjin and Peking.

Following the establishment of the People's Republic of China, the locomotives were designated the China Railways KF class. Some of the locomotives survived in service until the early 1970s. One of them, no. 607, is preserved at the National Railway Museum in the United Kingdom.[12]


The lone 242A1 prototype of the Société Nationale des Chemins de fer Français (SNCF) was one of the four known classes of three-cylinder 4-8-4 locomotives. It also had the distinction, along with an experimental high pressure locomotive of the New York Central Railroad in the United States of America, of being one of the two compound 4-8-4s. It was rebuilt by Andre Chapelon from the unsuccessful 1932 three-cylinder 4-8-2 simple expansion locomotive no. 241.101 of the Chemins de Fer de l'État into a 4-8-4 compound locomotive. This remarkable locomotive achieved extraordinary power outputs and efficiency in coal and water consumption, but no further examples were built since the SNCF focused on electric traction for its future motive power development.[13]

The 242A1 was put through trials on many test runs which showed that this locomotive was equal in power output to the existing SNCF electric locomotives at the time. Here, for the first time in Europe, was a steam locomotive with a Script error: No such module "convert". axle load which was not only at least as powerful as the most powerful existing high-speed electric locomotive, but which could repeatedly achieve its maximum power without any mechanical trouble. Developing Script error: No such module "convert". and with Script error: No such module "convert". of peak tractive effort and Script error: No such module "convert". of mean tractive effort, nothing in Europe could match it.

While the 242A1 was being tested, electrical engineers were designing the locomotives for the Script error: No such module "convert". line between Paris and Lyon, which was to be electrified. An electric locomotive that was to be slightly more powerful than the successful Paris to Orléans 2-D-2 type electric locomotive was being contemplated. When the test results of the 242A1 became known, however, the design was hurriedly changed to incorporate the maximum capacity possible with a Script error: No such module "convert". axle load, resulting in the Script error: No such module "convert". 9100 class with a power output of more than Script error: No such module "convert". more than that of the original design.

The performances of the Mistral and other heavy passenger express trains would therefore not have been so outstanding if the 242A1 had not existed and Andre Chapelon therefore indirectly influenced French electric locomotive design. In addition, the 242A1 demonstrated the suitability of the Sauvage-Smith system of compounding for French conditions and the designs for future French steam locomotives, that were prepared but never produced, were to make use of the Sauvage-Smith compounding system.

In service, the 242A1 was allocated to the Le Mans depot and between 1950 and 1960 it hauled express trains over the Script error: No such module "convert". between Le Mans and Brest. It did not remain in service long, however, and was withdrawn and scrapped in 1960.


In 1939 the Deutsche Reichsbahn placed two prototype three-cylinder DRB Class 06 2D2-h3 heavy express locomotives in service, built by Krupp in 1938. Along with the lone 242A1 of the Société Nationale des Chemins de fer Français (SNCF) and the lone Victorian Railways H class in Australia, it was one of the three known classes of three-cylinder 4-8-4 locomotives. Due to the outbreak of World War II only the two locomotives were produced.

With three Script error: No such module "convert". cylinders, large Script error: No such module "convert". driving wheels, a high Script error: No such module "convert". boiler pressure and Script error: No such module "convert". of tractive effort, they were capable of a maximum speed of Script error: No such module "convert". and could haul a 650 tonne train at Script error: No such module "convert".. Many parts, such as the boiler, were standardised with that of the DRG Class 45 heavy freight locomotive. The streamlined Class 06, the only German 4-8-4, was the biggest steam locomotive ever built in Germany. The two locomotives were shedded in Frankfurt and were placed in service on the line to Erfurt. No. 06.002 was bombed and destroyed during the hostilities and no. 06.001 survived until 1951, when it was retired and scrapped.[14]


In 1946 the Ferrocarriles Nacionales de México (N de M) placed orders with American Locomotive Company and Baldwin Locomotive Works for sixty Niágara locomotives for use on its principal express passenger services on upgraded lines, but the order was reduced to thirty-two in favour of diesel-electric locomotives. These QR-1 class locomotives were used mainly on lines north of Mexico City and were nicknamed "La Maquina". All were taken out of service in the late 1960s. Number 3028 survives, although not in operating condition, stored on the deadline at the New Hope and Ivyland Railroad in New Hope, Pennsylvania.[citation needed]

New Zealand

New Zealand adopted the narrow 3 ft 6 in (1,067 mm) to minimise railway construction costs and, due to the mountainous terrain, the loading gauge was restricted to a maximum height of Script error: No such module "convert". and width of Script error: No such module "convert"., making it one of the most restrictive loading gauges in the world. While this undoubtedly reduced the cost of building the two hundred-odd tunnels on the railway system, it posed major problems for locomotive designers which were exacerbated by an axle load limit of Script error: No such module "convert"..[15]

After the Soviet Union and South Africa, the New Zealand Railways Department (NZR) had the largest fleet of 4-8-4 locomotives outside North America, with seventy-one similar locomotives in the K class, KA class and KB class.[15]

The K class was designed by R.J. Gard to the requirements of Locomotive Superintendent P.R. Angus and was built locally at the Hutt Workshops of the NZR. The first locomotives were delivered during the depths of the Depression in 1932. The Script error: No such module "convert". grate and comparatively large boiler was slung low on a narrow frame to keep within the height restrictions, and width restrictions were adhered to with sloped cab sides and the mounting of two single stage air compressors in front of the smokebox.[15][16]

File:Locomotive Ka 942.jpg
NZR KA class no. 942

After the construction of thirty K class locomotives, the NZR developed the design to strengthen the frame and introduced other improvements such as roller bearings on all axles and ACFI (Accessoires pour les Chemins de Fer et l'Industrie) feedwater heaters. Introduced from 1939, they were also built in NZR workshops, most of them with streamlined shrouding to cover the external pipe work of their feedwater heater systems. The first thirty-five locomotives were designated KA class and worked on the North Island mainlines with the older K class locomotives.[15]

Six more were built, designated KB class, for service on the steeply graded Midland line on the South Island. These locomotives were equipped with trailing truck boosters, which raised their tractive effort by Script error: No such module "convert"..[15]

On occasion these 4-8-4s recorded speeds up to Script error: No such module "convert".. The streamlining shrouds of the KA and KB classes were removed in the late 1940s when the ACFI feedwater heaters were replaced with exhaust steam injectors. The last of these locomotives was withdrawn in 1968 due to dieselisation. Seven have been preserved, K class numbers 900, 911 and 917, KA class numbers 935, 942 and 945 and KB class number 968.[17][18]

South Africa

Between 1953 and 1955 the South African Railways (SAR) placed fifty Class 25NC 4-8-4 Northern locomotives in service. Designed under the direction of Chief Mechanical Engineer L.C. Grubb, eleven of these locomotives were built by North British Locomotive Company (NBL) and thirty-nine by Henschel & Son. Two versions of the same locomotive were built, the Class 25NC being the non condensing version, hence the "NC" suffix to the class number.[19]:110[20]:77–78

File:3511 - Hartswater 240481.jpg
SAR Class 25 no. 3511

Ninety Class 25 condensing locomotives were introduced simultaneously, acquired as a means to deal with the shortage of adequate supplies of suitable locomotive water in the arid Karoo. The design work on the engine’s condensing apparatus and the enormous condensing tender was carried out by Henschel, who built one locomotive complete with tender as well as sixty of the condensing tenders, to which they held the patent. The other eighty-nine condensing locomotives and thirty tenders were built by NBL.[19]:108–111[20]:77–78

File:SAR Class 25 3511 (4-8-4) Tender.JPG
Condensing tender, Henschel 28790

At approximately Script error: No such module "convert". in length, the condensing tenders are about Script error: No such module "convert". longer than their engines. One third of the total length of the tender is taken up by the water tank and coal bunker, while the rest is taken up by eight large radiators on each side, cooled by five steam-driven roof-mounted fans. Roller bearings were used throughout on all these locomotives, including the coupling and connecting rods, the crosshead gudgeon pins as well as the three-axle bogies of both the standard and condensing tenders. The leading bogies and driving wheels had Cannon-type axle boxes. The cylinders and frames were cast in one piece, while the steel cylinders and steam chests were fitted with cast iron liners. The tender frames of both types were also one piece steel castings. Since they were entirely mounted on roller bearings, very little effort was required to move these locomotives.[19]:108–111[20]:77–78

On the condensing locomotives, spent steam was recycled and condensed back to water for repeated use. Since the steam wasn’t expelled up the chimney, the smokebox contained a steam turbine driven fan beneath the chimney in order to keep the draught going. Visual evidence of this altered and slightly longer smokebox is the locomotive’s banjo face smokebox front. The system proved extremely efficient and reduced water consumption by as much as 90% by using the same water up to eight times over, which gave the Class 25 a range of Script error: No such module "convert". between water refills. In addition, the hot recycled feedwater resulted in significantly reduced coal consumption.[19]:108–111

File:SAR Class 25NC 3480 (4-8-4) Tender.JPG
Ex condensing Worshond tender

However, the Class 25 was a complex locomotive that required high maintenance, especially on the turbine blower fans in the smokebox, whose blades needed to be replaced frequently due to damage by solid particles in the exhaust. The equally complex condensing tender also required frequent maintenance. Between 1973 and 1980, partially motivated by the spread of electric and diesel-electric traction, all but three of the locomotives were converted to free exhausting and non condensing locomotives and reclassified to Class 25NC. In the process their condensing tenders were also rebuilt to ordinary coal-and-water tenders by removing the condensing radiators and roof fans and replacing it with a massive round topped water tank. Since the tenders were built on single cast steel main frames, it was impractical to attempt to shorten them. Locomotives with these rebuilt tenders were soon nicknamed "Worshond" (Sausage dog or Dachshund).[21]:107–109

File:3450 - Pretoria 250481.jpg
Class 26 "Red Devil" no. 3450

The Class 26, popularly known as the "Red Devil", was rebuilt from Henschel-built Class 25NC number 3450 by mechanical engineer David Wardale. The rebuilding took place at the Salt River shops of the SAR in Cape Town and was based on the principles developed by Argentinian mechanical engineer L.D. Porta. The primary objectives of the modifications were to improve the combustion and steaming rate, to reduce the emission of wasteful black smoke and to overcome the problem of clinkering. This was achieved by the use of a Gas Producer Combustion System (GPCS), which relies on the gasification of coal on a low temperature firebed so that the gases are then fully burnt above the firebed. The GPCS minimises the amount of air being drawn up through the firebed, the main source of air required for combustion being through ancillary air intakes located above the firebed.[22][23][24]

The modified locomotive became the only Class 26. Compared to an unmodified Class 25NC, the Red Devil achieved a 28% measured saving on coal and a 30% measured saving on water, measured during freight service, and a 43% increase in drawbar power based on the maximum recorded drawbar power. Its approximate maximum range in full load freight service on 1% to 1.25% grades was Script error: No such module "convert". based on its coal capacity, and Script error: No such module "convert". based on its water capacity. The maximum recorded freight load hauled relative to gradient was Script error: No such module "convert". on 2% grades, and it could haul a Script error: No such module "convert". passenger train at a constant speed of Script error: No such module "convert". on 1% grades. The Red Devil’s great power, however, also turned out to be its one weakness. The Class 25NC had already proven to be on the slippery side and the much more powerful Class 26, with essentially still the same dimensions as the Class 25NC, was even worse. It was a poor performer at starting or at low speeds on steep gradients.[21]:194–198[22][23]

Soviet Union

Outside North America, the largest fleet of 4-8-4 locomotives was the Class P36 of the SZD (Sovetskie Zheleznye Dorogi or Soviet Railways), of which 251 were built by the Kolomna locomotive works between 1949 and 1956. As the last Soviet standard class steam locomotive, the Class P36 shared some common components and design attributes with earlier standard Soviet designs such as the L class 2-10-0 Decapod type and LV class 2-10-2 Santa Fe type, as well as some common attributes with the P34 class 2-6-6-2 Mallet and P38 class 2-8-8-4 Yellowstone type Mallet. For example, the P36 and LV classes shared the same feedwater heater, made by the Bryansk machine factory. They were the only semi-streamlined steam locomotives built in Russia apart from a trio of fully streamlined 4-6-4 Baltic type locomotives.[citation needed]

The Class P36 was one of the best passenger steam locomotive classes built in the Soviet Union. They had boilers with Script error: No such module "convert". of heating surface that had a working boiler pressure of Script error: No such module "convert".. Russian-designed roller bearings were fitted throughout and the boilers were designed to provide a continuous steaming capacity of Script error: No such module "convert". per Script error: No such module "convert". of heating surface in the boiler. With its Script error: No such module "convert". cylinders and Script error: No such module "convert". diameter driving wheels it could easily attain speeds up to Script error: No such module "convert". with passenger trains of up to Script error: No such module "convert"..[citation needed]

The Class P36 first appeared on the Oktyabrskaya Railway (October Railway) to haul principal express trains between Moscow and Leningrad, but they did not remain on this Script error: No such module "convert". mainline long. Diesels took over after only a few years and the P36 class locomotives were transferred to other lines and depots, such as the Moscow–Kursk and Moscow–Ryazan lines, Kalinin, Krasnoyarsk, Belarusian Railway, Melitopol depot, Kuibyshev and Alexandrov depot.[citation needed]

Later, when electrification and dieselisation expanded, many of the Class P36 locomotives were transferred to work on the Lviv, Far East, Eastern Siberia, and Transbaikal Railways. The last was withdrawn from regular scheduled express passenger train service in 1974. All were staged in full working order and kept in reserve for times of extraordinary demand. At certain intervals the locomotives were taken out from staging, steamed up and put to work to haul trains to test the condition of the locomotives. In the late 1980s these strategic reserves of locomotives were disbanded and the Class P36 locomotives were distributed to museums and for preservation. Some, that had not seen regular use for more than fifteen years and were in the worst mechanical condition, were scrapped. It was found that the roller bearings suffered most by standing unused. When the computerised new class numbers were introduced by the Russian Ministry of Railways, the Class P36 were designated Class 1000.0001 to 1000.0251. In the 1990s, after the collapse of the Soviet Union, a number were sold to private train operators.[citation needed]


The 242F class express passenger 4-8-4 locomotives were designed by the Red Nacional de los Ferrocarriles Españoles (RENFE) in 1955 and were remarkably well-proportioned. Developed from a preceding 4-8-2 Mountain type, they had improved steam passages and developed 30 to 40 per cent more power at medium cut-offs and high speed. Ten of these locomotives were built by La Maquinista Terrestre y Maritima SA in Barcelona to burn fuel oil. They had Witte type smoke deflectors and were fitted with a double KylChap (Kylälä-Chapelon) blast-pipe, a Worthington feedwater heater and a Traitement Integral Armand (TIA) water-softening device. To increase the comfort of the locomotive crew, the cabs had wooden floors mounted on springs, and the seats of the driver and fireman were also sprung, a very welcome improvement for long runs on poor tracks. These locomotives were painted in a green livery when turned out from the builder's works at Barcelona and were consequently nicknamed "Los Verdes" (The Greens).[citation needed]

The 242F class was the fastest Spanish steam locomotive. When tested on the line from Barcelona to Tarragona, over Script error: No such module "convert". of practically level and straight line between Vilanova i la Geltrú and San Vincente, a speed exceeding Script error: No such module "convert". was sustained twice, first with a train of 430 tons and then with a train of 480 tons. High-capacity tests took place between Madrid and Ávila, when a train weighing 426 tons, including a dynamometer car, was hauled at sustained speeds of Script error: No such module "convert". up a gradient of 3½% (1 in 286), Script error: No such module "convert". up a gradient of 10½% (1 in 95) and Script error: No such module "convert". up a gradient of 22.8% (1 in 44.5). The gross horsepower figures recorded with the dynamometer car were 1790, 2350 and 2320 respectively, the calculated horsepower on the rail being 2600, 3400 and 3580. The latter output translates to about Script error: No such module "convert"..

With these locomotives there was some concern about water supply. The capacity of the tender was limited at only Script error: No such module "convert". and, with few watering points in service, the full capacity of the locomotive was not always used for fear of running short of this essential commodity in the semi-arid Spanish landscape. For example, for the Script error: No such module "convert". stretch between Medina del Campo and Burgos that rises Script error: No such module "convert". with an uphill start, three intermediate stops, one slack and some shunting movements to couple extra coaches to the train, the amount of water consumed was about Script error: No such module "convert"..[citation needed]

All ten locomotives were allocated to the Miranda de Ebro shed to haul principal heavy express trains. In the 1960s they were a familiar sight at the head of the premier express trains, but in 1971 they were transferred entirely to semi-fast passenger trains and even to the haulage of heavy seasonal fruit trains between Castejón and Alasua from October to January. One locomotive, no. 242F.2009, is preserved at the Madrid Railway Museum.[citation needed]

United States

File:Steam locomotive in Vancouver, Washington -a.jpg
Spokane, Portland and Seattle no. 700

The American 4-8-4 was a heavy locomotive, with nearly all examples in the United States having axle loads of more than 30 short tons. On railroads with rail of Script error: No such module "convert"., axle loads of more than 36 short tons were permitted. Exceptionally heavy Northerns were therefore introduced on the Atchison, Topeka and Santa Fe (Santa Fe), Chicago and North Western (CNW), Chesapeake and Ohio (C&O), Milwaukee Road, Northern Pacific (NP), Norfolk and Western (N&W), Spokane, Portland and Seattle (SP&S) and Western Maryland (WM) railroads. The preserved SP&S no. 700 is a surviving example of the three SP&S Class E-1 locomotives, which had the heaviest axle load of all at 37.1 short tons. The lightest Northerns in the United States were the six H-10 class locomotives of the Toledo, Peoria and Western (TPW), with an axle load of 23 short tons.[25][26]

Some Northerns were used on exceptionally long runs.

Several of the earlier 4-8-4 locomotive models were modified or rebuilt during their service lives.

  • Santa Fe developed their Northerns for years. The fourteen 3751 class locomotives that were introduced in 1927 and 1928 were of conservative design, with Script error: No such module "convert". driving wheels and a boiler pressure of Script error: No such module "convert".. In 1938, these locomotives were rebuilt with more modern features, including new Script error: No such module "convert". Boxpok driving wheels, increased size steam passages to and from the cylinders, the boiler pressure raised to Script error: No such module "convert". and roller bearings on all engine axles. This gave them a maximum drawbar power of Script error: No such module "convert". at Script error: No such module "convert".. Engine no. 3752 was equipped with Franklin rotary cam poppet valve gear and achieved the very low steam rate of 13.5 lb per indicated horsepower-hour (2.28 mg/J). These locomotives were permitted to run at Script error: No such module "convert"., but they were alleged to have exceeded Script error: No such module "convert". several times.[27]
  • The heavy Class H Northerns of the Chicago and Northwestern railroad were rebuilt in 1940 with lightweight rods, Boxpok driving wheels and roller bearings on all axles, and the boiler pressure was raised from Script error: No such module "convert".. Some years later twenty-four of them underwent another rebuild, which included new nickel-steel frames, new cylinders, pilot beams and air reservoirs, new fireboxes and other minor improvements. These were reclassified as Class H-1.[30]

Some Northern locomotives were also rebuilt from older locomotives. Between 1945 and 1947 the Reading Railroad rebuilt thirty of their heavy I-10 class 2-8-0 Consolidations to booster-fitted 4-8-4 Northern locomotives with Script error: No such module "convert". driving wheels. An additional ring was added at the smokebox end of the boiler, which increased the length of the boiler tubes from Script error: No such module "convert". to Script error: No such module "convert"., and a larger smokebox was installed which increased the distance between the tube plate and the chimney centre line from Script error: No such module "convert". to Script error: No such module "convert".. Steam pressure was raised from Script error: No such module "convert".. Four syphons were fitted, three in the firebox proper, and one in the combustion chamber. A twelve-wheeled tender was attached weighing 167 tons loaded, with a capacity of 23.5 tons of coal and Script error: No such module "convert". of water. A new cast steel frame was used, with the cylinders cast integral, and roller bearings on all axles. They were reclassified to T1 and numbered 2100 to 2129. Two of these locomotives, preserved for hauling special trains, were still in use in 1963.[31]

The Northerns were workhorses that went without much public recognition, with a few exceptions. The Class GS-4 "Golden State" locomotives of Southern Pacific (SP), of which thirty-six were built by Lima Locomotive Works in 1941 and 1942, were semi-streamlined and were given a striking livery with a broad orange valence over the wheels below a smaller red band that came halfway up the cab windows. The locomotives headed the "Coast Daylight" train over the railroad's Coast Line between Los Angeles and San Francisco. The intro of Adventures of Superman was introduced by an SP GS-4 as the announcer declared that Superman was "more powerful than a locomotive." One of them, GS-4 no. 4449, has been restored and is in operating condition.[32]

Even after the demise of steam, the Northern type has been in the spotlight of publicity and has been the favoured type to provide mainline excursions in the United States. Union Pacific 844 of the Union Pacific FEF Series is the only steam locomotive of a Class I railroad never to have been retired.

North American production list

Most North American 4-8-4s were built by ALCO, Lima and the Baldwin Locomotive Works, while Canadian National Railway's fleet was built by Montreal Locomotive Works. Only the Canadian Pacific Railway, the Norfolk and Western Railway, the St. Louis Southwestern Railway (Cotton Belt) and the Reading Railroad built their own.[33]

The Northern type was used by thirty-seven railroads in the Americas, including thirty-one railroads in the United States, three in Canada, one in Mexico and two in Brazil. In all, there were fewer than 1,200 locomotives of this type in North America, compared to the approximately 2,500 4-8-2 Mountain types and 6,800 4-6-2 Pacific types. By far the largest fleet was owned by the CN and its subsidiary, the Grand Trunk Western Railroad, with altogether 203 locomotives.[1]:296,299[33]

Preservation by country

In many countries the 4-8-4 was a late development of the steam locomotive, close to the time of steam's demise. Many more were therefore preserved than of other older wheel arrangements, either plinthed or in museums, with several being kept in running condition. Some of the more notable preserved Northerns world-wide are:

New Zealand
  • K 900: On static display at MOTAT in Auckland next to New Zealand DA class locomotive No. 1400.
  • K 911: Under overhaul at Mainline Steam, Plimmerton, Wellington.
  • K 917: Stored, missing many parts, Steam Incorporated, Paekakariki, Wellington.
  • KA 935: Awaiting overhaul at the Silver Stream Railway, near Wellington, New Zealand.
  • KA 942: In service at Mainline Steam, Plimmerton, Wellington, was used on mainline excursions.
  • KA 945: Stored in dismantled condition at Steam Incorporated, Wellington.
  • KB 968: Owned by Canterbury Railway Society, leased to Mainline Steam. Under overhaul at Mainline Steam, Christchurch.
South Africa
  • Class 25 3511: Condenser, staged at Beaconsfield, Kimberley.
  • Class 25NC 3432: Stored at Mainline Steam, Auckland, New Zealand.
  • Class 25NC 3442: Operated by Rovos Rail, Capital Park, Pretoria.
  • Class 25NC 3454: Ex condenser with dual Lempor exhaust, staged at Bloemfontein.
  • Class 25NC 3484: Ex condenser, operated by Rovos Rail, Capital Park, Pretoria.
  • Class 25NC 3508: Stored at Mainline Steam, Auckland, New Zealand.
  • Class 25NC 3533: Ex condenser, operated by Rovos Rail, Capital Park, Pretoria.
  • Class 26 3450: The "Red Devil", staged at Monument Station, Cape Town.
Soviet Union
  • P36-0001: Restored to working order at Roslavl in 2005. Currently displayed at Rizhsky Station, Moscow.
  • P36-0027: Shushary Railway Museum, St. Petersburg.
  • P36-0031: Troitsk in working order.
  • P36-0032: The only private steam locomotive operated in Russia, owned by GW Travel.
  • P36-0050: Brest Railway Museum.
  • P36-0058: Zlatoust derelict.
  • P36-0064: Brest Railway Museum, Belarus Railways.
  • P36-0071: Cosmetically restored and on display in Nizhny Novgorod.
  • P36-0091: Skovorodino station.
  • P36-0094: Belogorsk station.
  • P36-0096: Severobaik station.
  • P36-0097: Seyatel Station Museum.
  • P36-0107: Park near Irkutsk.
  • P36-0110: Mogzhon station.
  • P36-0111: Orsha station, Belarus.
  • P36-0120: Now restored to working order at Tikhoretsk. Returned to Moscow 03/09/13 for the '1520 Railway Exhibition' at Scherbinka. Currently based in Moscow.
  • P36-0123: Prora Museum, Ruegen Island, Germany.
  • P36-0124: Chernyshevsk depot.
  • P36-0147: Sharya station.
  • P36-0182: Cosmetically restored and on display in Chelyabinsk.
  • P36-0192: Taiga station.
  • P36-0218: Rostov Railway Museum, currently under restoration to working order at Tikhoretsk.
  • P36-0228: Uulan Baatar Railway Museum, Mongolia.
  • P36-0232: Cosmetically restored at Zlatoust in 2009 for display in Samara. May display a different number.
  • P36-0249: Shushary Railway Museum, St. Petersburg.
  • P36-0250: Tashkent Railway Museum, Uzbekistan.
  • P36-0251: Warsaw Station Museum, St. Petersburg.
  • RENFE242F-2009: Retired in 1973, restored in 1989 and another time in 2005. Although she is in running order, usually is in static display at Museo Nacional Feroviario, Madrid-Delicias.
United States of America


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External links