USATC S100 Class. The United States Army Transportation Corps (USATC) S100 Class is a  steam locomotive that was designed for switching (shunting) duties in Europe and North Africa during World War II.  After the war, they were used on railways in Austria, China, Egypt, France, Great Britain, Greece, Iran, Iraq, Israel, Italy, the Netherlands, Palestine, the United States, and Yugoslavia.

Wartime development and use
The S100 is a side tank designed by Col. Howard G. Hill. In 1942, the USATC ordered 382 S100s from Davenport Locomotive Works of Iowa, H. K. Porter, Inc, of Pittsburgh and Vulcan Iron Works of Wilkes-Barre. They were shipped to the British War Department in 1943, where they were stored until 1944. After D-Day, most went overseas but some remained in store.

Construction

Use after the Second World War
After the Second World War, SNCF bought 77 S100's and designated them class 030TU. Jugoslovenske železnice (Yugoslav State Railways) bought many S100's and designated them class 62. In the 1950s JŽ assembled more examples bringing the number of class 62 to 129. The Hellenic State Railways in Greece acquired 20 S100's and designated them class Δα (Delta-alpha). Österreichische Bundesbahnen in Austria acquired 10 and designated them class 989. Ferrovie dello Stato in Italy acquired four and designated them class 831.

Several were sold into industrial use in the US, including to Georgia Power and Oklahoma Gas & Electric.

The Oranje-Nassau Mijnen, a coal mining company in The Netherlands acquired two S100's (USATC 4389 and 1948)and numbered them ON-26 (Davenport 2533) and ON-27 (Davenport 2513) respectively. The ON-26 survived the scrapyard and was sold to the museum railway Stoomtrein Goes-Borsele.

Other S100's entered British industrial use with the National Coal Board, Longmoor Military Railway, Austin Motor Company and others.

China acquired about 20 S100's, designating them class XK2. In 1946, Egyptian State Railways bought eight and numbered them 1151–1158. The UK War Department loaned six to Palestine Railways. In 1946 PR bought two of these, both of which subsequently entered the stock of Israel Railways in 1948.

Iraqi State Railways bought five, designated them Class SA, and gave them fleet numbers 1211–1215. All five were Davenport-built examples. At least two were still in service in March 1967: 1211 at Basrah and 1214 as the station pilot at Baghdad West.

Southern Railway

The Southern Railway (UK) bought 15 S100's (14 for operational use and one for spare parts) and designated them USA Class. They were purchased and adapted to replace the LSWR B4 class then working in Southampton Docks. SR staff nicknamed them "Yank Tanks".

By 1946 the SR needed either to renew or replace the ageing B4, D1 and E1 class tanks used in Southampton Docks, but Eastleigh Works was not in a position to do so in a timely manner or at an economic price. The replacement locomotives would need to have a short wheelbase to negotiate the tight curves found in the dockyard, but be able to haul heavy goods trains as well as full-length passenger trains in the harbour area.
The railway's Chief mechanical engineer, Oliver Bulleid therefore inspected the surplus War Department tank locomotives. The Hunslet Austerity 0-6-0ST locomotives stored at the Longmoor Military Railway proved to be unsuitable for dock work because of their  wheelbase and inside cylinders, and also many of the survivors were in poor condition. However, the S100s stored at Newbury Racecourse had a  wheelbase, outside cylinders and had hardly been used. Those available for sale had been built by the Vulcan Iron Works of Wilkes-Barre Pennsylvania and H. K. Porter, Inc, of Pittsburgh.

Bulleid therefore took Vulcan-built locomotive WD4236 on approval in May 1946 and tested it thoroughly over the next few months. When it was found to be suitable, this locomotive and a further thirteen were purchased in 1947 for £2500 each. Six of these had been built by Porter and the remainder by Vulcan. However, when it was discovered that there were differences in dimensions between the locomotives from different builders the SR exchanged its Porter built locomotives for Vulcans, but could only do so with five examples. The railway therefore accepted one Porter locomotive at a reduced price and purchased another to provide spare parts. Thus, the thirteen further locomotives entered traffic between April and November 1947 as soon as they had been adapted.

Construction and adaptation

Following purchase, members of the class were fitted with steam heating, vacuum ejectors, sliding cab windows, additional lamp irons and new cylinder drain cocks. Further modifications became necessary once the locomotives started to enter traffic, including large roof-top ventilators, British-style regulators (as built they had US-style pull-out ones), three rectangular cab-front lookout windows, extended coal bunkers, separate steam and vacuum brake controls and wooden tip-up seats. This meant that it took until November 1947 for the entire class to be ready for work. Radio-telephones were later installed on the footplate to improve communication on the vast network of sidings at Southampton.

The class was allocated the British Railways (BR) power classification 3F following nationalisation in 1948.

Numbering
The original locomotive carried the War Department number 4326, and the subsequent purchase were numbered between 1264 and 1284 and between 1952 and 1973. Thirteen of the locomotives were re-numbered in a single sequence from 61 to 73 by SR but 4326 retained its War Department number. The locomotive used for spares was not numbered. After 1948 they were renumbered 30061–30074 by BR. Six examples were transferred to departmental (non-revenue earning) use in 1962/3 and renumbered DS233–DS238.

Livery
During the Second World War they were painted USATC black with white numbering and lettering 'Transportation Dept.' on the tank sides.  Prior to nationalisation, the locomotives were painted in Southern black livery with 'Southern' in "Sunshine Yellow" lettering. The lettering on the tank sides was changed to 'British Railways' during 1948 as a transitional measure. Finally, the class was painted in BR Departmental Malachite livery, with BR crests on the water tank sides and numbers on the cab sides.

Operational details

For fifteen years the entire class was used for shunting and carriage and van heating in Southampton Docks. They performed well and were popular with the footplatemen, but the limited bunker capacity often necessitated the provision of relief engines for some of the longer duties. Two examples were fitted with extended bunkers to address this problem in 1959 and 1960, but a more ambitious plan to extend the frames and build larger bunkers was abandoned in 1960 due to the imminent dieselization of the docks. They also often suffered from overheated axleboxes which was less of a problem when shunting but prevented them from being used on longer journeys.

A more serious issue was the condition of the steel fireboxes originally fitted to the class which rusted and fatigued quickly. This was partly due to their construction under conditions of austerity, and the hard water present in the docks. This came to a head in 1951 when several had to be laid aside until new fireboxes could be constructed. Thereafter there were no further problems.

The class was replaced from their shunting duties at Southampton from 1962 by British Rail Class 07 diesel-electric shunters, when the first member of the class was withdrawn, but the remainder were still in fairly good condition. The survivors were used for informal departmental purposes such as providing steam heating at Southampton or shunting at Eastleigh Motive Power Depot, before the withdrawal.  30072 became the pilot locomotive at Guildford Motive Power Depot and continued to carry out this duty until the end of steam on the Southern in July 1967. Six examples were officially transferred to ‘departmental’ duties and renumbered. These went to Redbridge Sleeper Depot (DS233), Meldon Quarry (DS234), Lancing Carriage Works (DS235 and DS236), and Ashford wagon works (DS237 and DS238; where they were named Maunsell and Wainwright).

Nine examples remained in service until March 1967 and five of these survived until the end of steam on the Southern Region four months later. Two of these engines, 30065/DS237 and 30070/DS238, were sold to Woodham Brothers in South Wales in March 1968. However, before they could make their journey, their bearings ran hot and were declared "unfit for travel" which led to the two tank engines being dumped at Tonbridge. Five months later, they were taken to Rolvenden where they were purchased for preservation.

Stock list

Postwar design influence
Several European railways produced designs based on the S100. JŽ added to their class 62 by ordering several similar examples from Đuro Đaković (factory) of Slavonski Brod, Croatia. These differed in minor details, principally the use of plate frames instead of bar frames, resulting in a higher boiler pitch. This gives the steam pipes a shoulder instead of being straight, and requires smaller domes with a flatter top to fit JŽ's loading gauge.

The British Great Western Railway (GWR) had used many S100s in South Wales during the Second World War. The GWR 1500 Class was partially inspired by the S100 in its use of outside cylinders and short wheelbase.

Continuing commercial use
A small number of former JŽ 62's remain in commercial service, more than 65 years after they were built. At least two work as switcher locomotives (shunter locomotives) at the ArcelorMittal steel plant in Zenica, Bosnia-Herzegovina.

Survival and preservation
More than 100 S100s survive: either preserved, stored, or derelict. Most are in Europe or North America, but there are also two in China and one in Egypt. Project 62 has an online database of them.

Private owners in Baraboo, Wisconsin, are currently restoring S100 #5002. #5002 was used for the Naval Yards in Philadelphia, Pennsylvania, and later sold to the EJ Lavino Company in Pennsylvania, then sold to Tombstone Junction and later to the Kentucky Railroad Museum.

In 2006, one was purchased for preservation from steelworks in central Bosnia and was sent to Britain.

USA class

Four British examples of the USA class have been preserved:

 30064 Privately owned - (Previously preserved at the Bluebell Railway but left in 2022 after being purchased by a private buyer with plans to restore to working order).
 30065 Kent and East Sussex Railway - (Under overhaul)
 30070 Kent and East Sussex Railway - (Operational) Returned to service in December 2017 following overhaul and outshopped in Longmoor Military Railway Lined Blue as No. 300 Frank S. Ross.
 30072 Ribble Steam Railway - (Undergoing major boiler repairs)
Two JŽ class 62 locomotives built by the former Yugoslav Railways to foreign design have been acquired for use on the North Dorset Railway and given British liveries. There are minor technical differences.
 *30075 (formerly 62-669 built 1960- (Undergoing overhaul)
 *30076 (formerly 62-521 built 1954- Stored).

In fiction
An engine of this prototype appears in the Thomas & Friends TV series as Rosie.

Gallery

References

Sources

Further reading

External links 
 USA 0-6-0T Southern E-Group
 Loc 4389  Stoomtrein Goes-Borsele
 Project 62 Project 62 - owners of 30075 and 30076
 USA 0-6-0T Southern E-Group
 SR USA Dock Tank SR "USA" class Dock Tank No.WD 1959 (BR 30064) Bluebell Railway

 
S100 Class
War Department locomotives
0-6-0T locomotives
Davenport locomotives
H. K. Porter locomotives
Vulcan Iron Works locomotives
Railway locomotives introduced in 1942
Steam locomotives of Austria
Steam locomotives of China
Steam locomotives of Great Britain
Steam locomotives of Iraq
Steam locomotives of Mandatory Palestine
Steam locomotives of the United States
Standard gauge steam locomotives of Great Britain
Standard gauge locomotives of Austria
Standard gauge locomotives of China
Standard gauge steam locomotives of Egypt
Standard gauge locomotives of Iraq
Standard gauge steam locomotives of Israel
Standard gauge locomotives of Mandatory Palestine
Standard gauge locomotives of the United States
Shunting locomotives