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4-6-4

4-6-4, under the Whyte notation for the classification of locomotives, represents the wheel arrangement of four leading wheels, six powered and coupled driving wheels and four trailing wheels. In France where the type was first used, it is known as the Baltic while it became known as the Hudson in most of North America.

Overview
Tender locomotives The 4-6-4 tender locomotive was first introduced in 1911 and throughout the 1920s to 1940s, the wheel arrangement was widely used in North America and to a lesser extent in the rest of the world. The type combined the basic design principles of the 4-6-2 type with an improved boiler and larger firebox that necessitated additional support at the rear of the locomotive. In general, the available tractive effort differed little from that of the 4-6-2, but the steam-raising ability was increased, giving more power at speed. The 4-6-4 was best suited to high-speed running across flat terrain. Since the type had fewer driving wheels than carrying wheels, a smaller percentage of the locomotive's weight contributed to traction, compared to other types. Like the 4-6-2, it was well suited for high speed passenger trains, but not for starting heavy freight trains and slogging on long sustained grades, where more pairs of driving wheels are better. The first 4-6-4 tender locomotive in the world was a four-cylinder compound locomotive, designed by Gaston du Bousquet for the Chemins de fer du Nord in France in 1911. Since it was designed for the Paris-Saint Petersburg express, it was named the Baltic after the Baltic Sea, which was a logical extension of the naming convention that started with the 4-4-2 and 4-6-2. The first 4-6-4 in the United States of America, J-1a #5200 of the New York Central Railroad, was built in 1927 to the railroad's design by the American Locomotive Company (ALCO). There, the type was named the Hudson after the Hudson River. They are also designed to pull 16-18 passenger cars in passenger service. The world speed record for steam locomotives was held by a 4-6-4 at least twice. In 1934, the Milwaukee Road's class F6 no. 6402 reached and, in 1936, the German class 05.002 reached . That record was broken by the British 4-6-2 number 4468 Mallard on 3 July 1938, when it reached , still the world speed record for steam traction. Tank locomotives The 4-6-4T was also a fairly common wheel arrangement for passenger tank locomotives. As such, it was essentially the tank locomotive equivalent of a tender locomotive, with water tanks and a coal bunker supported by four trailing wheels instead of in a tender. In New Zealand, some 4-6-4T locomotives (the Wab class) were tank versions of 4-6-2 locomotives (of the Ab class). The first known 4-6-4 tank locomotive was rebuilt from a Natal Government Railways (NGR) K&S Class 4-6-0T which was modified in 1896 to enable it to run equally well in either direction on the Natal South Coast line, where no turning facilities were available at the time. This sole locomotive later became the Class C2 on the South African Railways (SAR). The first known locomotive class to be designed with a 4-6-4T wheel arrangement, the NGR's Class F tank locomotive, was based on this modified locomotive and built by Neilson, Reid & Company in 1902. These became the Class E on the SAR in 1912. One streamlined 4-6-4T was built for the Deutsche Reichsbahn in 1935. ==Use==
Use
Australia ;Tender locomotives Seventy R class 4-6-4 tender locomotives, the only class of this configuration in Australia and built by North British Locomotive Company, were introduced by the Victorian Railways in 1951 for mainline express passenger operations. However, the introduction in 1952 of the B class diesel-electric locomotives saw the R class almost immediately being relegated to secondary passenger and freight use, with many being staged at depots around the state. A number were preserved and some of these continued to operate on special excursion trains. R class 711 With the privatisation of regional passenger operations in Victoria in the mid-1990s, two R class locomotives were brought back into normal revenue service by the West Coast Railway, for regularly scheduled mainline passenger trains between Melbourne and Warrnambool. The locomotives underwent a number of modifications to allow for reliable high speed operation, including dual Lempor exhausts, oil firing and the addition of a diesel control stand for multiple unit operation. The use of these R class locomotives ceased after the demise of the private operator in 2004. ;Tank locomotives The tank locomotive configuration was a popular type with the Western Australian Government Railways. The D class was introduced for suburban passenger service in 1912. Its successors, both also of the 4-6-4T wheel arrangement, were the Dm class of 1945 that was rebuilt from older E class 4-6-2 tender locomotives, and the Dd class of 1946. The New South Wales Government Railways 30 Class 4-6-4T locomotives were used on Sydney and Newcastle suburban passenger train workings from 1903 until the end of steam operations in the 1970s. No. 3046 is preserved at the Dorrigo Steam Railway & Museum. No. 3013 is stored, dismantled at the Canberra Railway Museum. 3085 is awaiting restoration at Goulburn Roundhouse. 3112 operated tour trains for a number of years but is currently out of service in Canberra. 3137 saw regular use in the 1970s and 1980s as part of the NSW Rail Museum operating fleet, but is out of service and now on static display at Thirlmere. Canada ;Tender locomotives at Steamtown, U.S.A. in Vermont The second-largest user of the type in North America was the Canadian Pacific with 65 H1a to H1e class locomotives, numbered 2800 to 2864 and built by Montreal Locomotive Works (MLW) between 1929 and 1940. They were highly successful and improved service and journey times on the CPR's transcontinental routes. The third and later batches of CPR Hudsons, H1c to H1e numbers 2820 to 2864, were dubbed Royal Hudsons and were semi-streamlined. Royal permission was given for these locomotives to bear the royal crown and arms after locomotive No. 2850 hauled King George VI across Canada in 1939. (Also see North American production list) ;Tank locomotives The Grand Trunk Railway (GTR) had six K2 class locomotives, built in September 1914 by MLW and acquired for suburban service. Numbered 1540 to 1545 on the GTR, they were reclassified as X-10-a and renumbered 45 to 50 after being absorbed by the Canadian National (CN) in 1923. Three of them are preserved, numbers GT 1541 (CN 46) in Vallee-Jonction, QC, (CN 47) at the Steamtown National Historic Site in Scranton, Pennsylvania, and GT 1544 (CN 49) at the Canadian Railway Museum in Delson, Quebec. (Also see North American production list) Finland in Keuruu, Finland The Finnish State Railways Class Pr2, nicknamed Henschel, was a gauge passenger tank locomotive class, ordered from Henschel & Son by the Estonian State Railways in the spring of 1939 and completed in 1941. The outbreak of the Second World War prevented their delivery to Estonia, but a few of these engines did operate in Latvia in 1942. They became superfluous when the Germans began converting the Baltic tracks to , and the four locomotives were sold to Finland. They were classified Pr2 and numbered 1800 to 1803 upon their arrival in Finland in December 1942. The Class Pr2 tanks were quite advanced locomotives and were based on the Henschel-built DRG Class 62 tank engine design of 1928 for the Deutsche Reichsbahn. After their initial teething problems were solved, they proved to be fast runners and an ideal addition to the motive power stable. They were originally built as oil-burners and reverted to this type of fuel between 1947 and 1954, when oil prices were low. With its coupled wheels, it was very fast and one of them achieved during a test run. No. 1803, the last Class Pr2 in service, was withdrawn in May 1960. Only no. 1800 has been preserved. France The four-cylinder compound locomotive designed by Gaston du Bousquet for the French Chemins de fer du Nord, of which two (3.1101 and 3.1102) were built at the company's workshops in 1911, was the first tender locomotive in the world with this wheel arrangement. Named the Baltic since it was intended for service on the Paris-Saint Petersburg express, its most remarkable feature was the en echelon arrangement of the two low-pressure inside cylinders in order to accommodate the very large bore. One of them was built with a water-tube firebox. Although they were not multiplied, they were the forerunners of the highly successful 4-6-2 Nord Pacifics and Super-Pacifics. (Also see Netherlands) Germany ;Tender locomotives Three tender locomotives were built for the Deutsche Reichsbahn (DRG) by August Borsig in 1935. Designated Class 05, they were designed for high speed running. They were three-cylinder locomotives with giant driving wheels and powerful clasp brakes on all wheels. India There were two classes of tender locomotives in India, both early in the history of the wheel arrangement and also of unusually narrow gauge. The nine G class locomotives of the gauge Barsi Light Railway in western India were built by Nasmyth, Wilson & Company in 1928 and 1930 and by WG Bagnall in 1939. The four ND class locomotives of the gauge Scindia State Railway in Gwalior were built in 1928 by Kerr, Stuart & Company. Indonesia Java Staatsspoorwegen as state-owned railways in Dutch East Indies ordered 39 units of 4-6-4T for the need of increasing traffic of express trains, manufactured by Swiss Locomotive and Machine Works (SLM), Switzerland, Armstrong Whitworth, UK and Werkspoor, Netherlands and soon classified as SS Class 1100 (SS 1101–1139) which were came in 1919–1920. The class was designed to meet the requirement to haul trains of 400 tons at a speed of on a incline with radius curves and must be able to turn corners with a radius of 120 metres and a speed of 80 kilometres per hour (50 miles per hour). These SS 1100s were initially made to work the express interurban train which connecting SurabayaMalang and could achieve its speeds at 100 kilometres per hour (62 miles per hour). The SS 1100s were superseded by more fast and reliable SS 1300s in 1921. As an alternative, several SS 1100s were made to work the East Java Express trains, working in tandem with the 2-8-0 SS Class 900 (D50) providing 5 hours travel between Surabaya and Banyuwangi. After Japanese occupation and Indonesian Independence they renumbered to C27 class. Of the 39 built, two are preserved as static exhibits at the Ambarawa Railway Museum and the Transportation Museum of Taman Mini Indonesia Indah. By 1921, 58 units of new express locomotives were built for the Java Staatsspoorwegen from 3 German builders (Henschel & Son, Sächsische Maschinenfabrik and Maschinenfabrik Esslingen) with specifications could haul some series of trains at speeds of 90 kilometres per hour (56 miles per hour) on flat line and 45 kilometres per hour (28 miles per hour) on incline, they were classified as SS Class 1300 (1301-1358). During some tests, the power output jumped to 1,000 horsepower (hp) from its design which only 900 horsepower. SS 1300s could easily driven at speeds of 100 kilometres per hour (62 miles per hour) on flat routes and 55 kilometres per hour (34 miles per hour) on inclines. It was declared the world's fastest steam locomotive on gauge when the drivers could spur locomotives up to After Japanese occupation and Indonesian Independence, they renumbered as C28 class. The C28s were one of the most popular in Indonesia especially for the drivers, beside achieving speeds of up to , they were reliable and also easy to maintain. One of the C28 class number 35 was also modified to tender locomotive (4-6-4) on Cepu line which carried out by Djawatan Kereta Api (DKA) or The Department of Railway of the Republic of Indonesia for presidential train. This modification was actually part of a plan carried out by SS since 1930s to modified their 4-6-4 tank engines to tender one using tenders from the scrapped Bull Moose Alco 2-8-8-0 SS Class 1200 (DKA DD50) to extend their operational range when hauled the express trains but it was cancelled due to Great Depression and Second World War. But unfortunately, the modified tank-tender locomotive was also scrapped in the end of steam ages in Indonesia. Ireland The first and longest-lived Baltics in Ireland were two locomotives, built by Nasmyth, Wilson in 1904 for the narrow-gauge County Donegal Railways. Both were later superheated and one lasted until 1967, albeit derelict. Japan |alt= Between 1947 and 1961, the Japanese National Railways built three classes of rather advanced American-style gauge Hudson tender locomotives. • Between 1947 and 1949, 33 Class C61 locomotives were rebuilt from former Class D51 Mikado freight locomotives. The Class C61 was the first Japanese locomotive with the Hudson wheel arrangement. • Between 1953 and 1961, 47 Class C60 locomotives were rebuilt from surplus Class C59 Pacific locomotives at the Hamamatsu and Kōriyama factories. model of the 4-6-4 C62 steam locomotive, made by Kato Precision Railroad Models The Class C60 and Class C61 were smaller locomotives than the Class C62, which filled the tight Japanese loading gauge. They were equipped with Boxpok driving wheels and used several American-style appliances, even though they had British-style smokebox doors. Malaysia The Federated Malay States Railways (FMSR, predecessor to the Malayan Railway (MR), and presently, Keretapi Tanah Melayu (KTM)) operated 17 locomotives of the 4-6-4T type as their class C. Four batches in all made up the class, with the first batch of five (class C1) being delivered by Nasmyth Wilson in 1930. Three more batches consisting of six, and two individual batches of five were ordered from the North British Locomotive Company (NBL) in 1939 (class C2), 1940 (class C3), and 1942, but the last batch of five was sent to the Middle East for use by the War Department (WD) since the Japanese had already occupied Malaya. Ultimately, the last batch would end up with the Jordan Hejaz Railway (JHR). The preexisting C class locomotives on the FMSR were reclassified as the 401, 402, and 403 class locomotives (formerly classes C1, C2 and C3) in 1946. (Also see France) There were also ten four-cylinder 6100 class locomotives, built in 1929 by Hohenzollern and Werkspoor and based on the 3700 4-6-0 class. The last two were withdrawn in 1958. Philippines There were two 4-6-4 tank locomotives built by the North British Locomotive Company as an extension of the original 120 class for the Manila Railroad Company built in 1910. Numbered Manila Railroad 127 and 128, the two locomotives were based in Tarlac City yards. No. 128 remained in service with the Manila Railroad by 1946 on the Canlubang branch line, and were scrapped before 1952. The original Manila Railroad 160 class was also assigned to an order of seven 4-6-4T types also built by NBL in 1914. However, due to World War I hampering the transfer of British equipment to Asia, the 4-6-4s were instead given to South Africa. Six tank locomotives, designed by SAR Chief Mechanical Engineer D.A. Hendrie and built by Nasmyth, Wilson & Company, were introduced on the SAR in 1915. Designated Class J, they had Walschaerts valve gear and Belpaire fireboxes and used saturated steam. Acquired to cope with increasing traffic on the Natal South Coast, but unable to handle the rapidly increasing loads due to their small proportions, they soon ended up being employed as shunting engines in the Durban harbour, at Mossel Bay and in the Cape Midlands, until they were withdrawn from service by 1957. In 1938 William Stanier considered a 4-6-4 express passenger locomotive design, together with a related 4-8-4 as a large mixed-traffic locomotive, but during WWII the British government forbade the development of express passenger locomotives. The 4-8-4 design did continue though and in 1942 was looked at by Fairburn, the acting CME, as a possible post-war type for fast goods trains. ;Tank locomotives A number of locomotives were built for various British railway companies. The first standard-gauge examples were Robert Whitelegg's design in 1912 for the London, Tilbury and Southend Railway (LT&SR). They were only delivered after the LT&SR had been taken over by the Midland Railway, where they were designated the 2100 class. Between 1914 and 1922, the London, Brighton and South Coast Railway (LB&SCR) built seven L class tank locomotives, known as the Brighton Baltics. The first examples suffered from instability problems until they were rebuilt with well-tanks. These high-speed tank locomotives hauled the famous Brighton Belle train until the electrification of the Brighton Main Line in 1933, after which they were converted into N15X class tender locomotives. They remained in service until 1957. The Glasgow and South Western Railway and a number of other railways also had tank locomotive classes of this wheel arrangement. • The Lancashire and Yorkshire Railway examples were very rare in having four cylinders. Known as the Dreadnought Tanks, they proved to be too large and too complex for the duties they performed. • The saturated steam tank locomotives of the Belfast and County Down Railway were highly unsuccessful because of poor valve settings. • Contrarily, the Furness Railway 115 class (which also used saturated steam but with inside cylinders) were very popular with their crews. United States , streamlined for the 20th Century Limited Except for the Grand Trunk Railway's K2 Class tank locomotives built in the 1910s, all American 4-6-4 locomotives had tenders. The first Hudson locomotive in North America was built in 1927 for the New York Central Railroad (NYC) by the American Locomotive Company (ALCO), to the railroad's design. The locomotive proved to be very successful and was named the Hudson type, after the Hudson River. Thirteen of these locomotives, one J-1e type and twelve J-3a types, were streamlined for use with named passenger trains like the Empire State Express and the 20th Century Limited. Between the NYC and its subsidiaries, the Boston & Albany Railroad (B&A), the Cleveland, Cincinnati, Chicago & St Louis Railway (CCC&StL or Big Four) and the Michigan Central Railroad (MC), they acquired altogether 275 locomotives of several different types, the largest Hudson fleet in North America. There were also some once-off and experimental locomotives. A number were rebuilt from Pacific locomotives, or in some cases from other designs. • The Baltimore and Ohio Railroad (B&O) built four as experimental locomotives between 1933 and 1936, using Colonel Emerson's water-tube fireboxes, but eventually turned to diesel-electric traction instead. • In 1937, the Illinois Central Railroad (IC) rebuilt a 2-8-4 Berkshire into its only Hudson, the Illinois Central No. 1, which was not a success and was not repeated. The railroad had also rebuilt seven 4-6-0s gained with acquisition of the Chesapeake, Ohio and Southwestern Railroad into 4-6-4Ts for easier bi-directional operation. All were scrapped with their line's electrification finishing in 1928. • The Wabash Railroad rebuilt its seven Class P1 Hudsons from their unsuccessful K-4 and K5 Class 2-8-2 Mikado locomotives. • From 1937 to 1941 the Frisco Railroad rebuilt their 10 1060 class 1917-built 4-6-2s. While large and powerful they had initially had firebox problems, but the rebuild as Hudsons resolved this in addition to further boosting their strength. They received blue streamlining on their running boards and some lasted into the last year of steam on the Frisco in 1952. • In 1946 the Chesapeake and Ohio Railway rebuilt their five F-19 class pacifics into hudsons, with four of them gaining streamlining. These were in addition the as-built 4-6-4s purchased and to be purchased by the road. They were intended to serve alongside the new streamlined M-1 class steam turbine locomotives on the new Chessie service. However, the train's launch was cancelled due to declining post-war passenger numbers, and dieselization meant both the rebuilds and newbuilds were all retired by the mid-1950s. One of the rebuilds, 490, has been preserved, still with its streamlining, at the Baltimore and Ohio Railroad Museum. North American production list Hudson Steam Locomotive at the B&O Railroad Museum in Baltimore, Maryland. The locomotive was built as a 4-6-2 Pacific in 1926 and modified to this configuration in 1946. Altogether 21 railroads in North America owned s. Many were similar in concept to the NYC Hudsons, with driving wheels, but most were a little larger than the NYC locomotives, such as the F6 and F6a classes of the Milwaukee Road, the class of the Canadian National, the Canadian Pacific locomotives, the class of the Burlington Route, the class of the New Haven and the 1151 class of the Lackawanna. The heaviest were the C&O's class at 443,000 lbs, There were also the lightweights, which include the class of the Nickel Plate Road, the class D of the Maine Central and the class of the Ferrocarriles Nacionales de México (N de M). On these, the extra axle was used to reduce the axle load in comparison to a Pacific locomotive. Because the design was really only optimally suited to express passenger trains, which were dieselised early, the Hudsons were early candidates for withdrawal and scrapping. None of the NYC locomotives survived and neither did any of the Milwaukee locomotives. Five Canadian Pacific Hudsons survive, including four Royal Hudsons and the un-streamlined Canadian Pacific 2816. Five of the Burlington Route locomotives survive, including the Aeolus. Other surviving 4-6-4 locomotives are two each of the Santa Fe and Canadian National, and single examples from the Chesapeake and Ohio Railway, N de M and Nickel Plate Road. The Pennsylvania Railroad also owned the P5 class of electric locomotives, also with a wheel arrangement. == Model railroading ==
Model railroading
The Lionel Corporation used the 4-6-4 arrangement in several of its locomotives. ==References==
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