Солтүстік Америкалық локомотивтер Британ теміржолында

The SR USA class are some ex United States Army Transportation Corps S100 Class steam locomotives purchased and adapted by the Southern Railway (SR) after the end of the Second World War to replace the LSWR B4 class then working in Southampton Docks. SR staff nicknamed them "Yank Tanks".

The United States Army Transportation Corps built 382 S100 Class 0 6 0 tank engine for use in the Second World War. They were shipped to the British War Department in 1943, and stored awaiting the invasion of Mainland Europe. Most went overseas but some remained in store. 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 11 feet (3 m) wheelbase and inside cylinders, and also many of the survivors were in poor condition. However, the S100s stored at Newbury Racecourse had a 10 feet (3 m) 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.

USATC No. SR No. BR No. Dept No. Builder Year Withdrawn Notes1264 61 30061 DS 233 Porter 7420 1942 March 1967 1277 62 30062 DS 234 Vulcan 4375 1942 March 1967 1284 63 30063 Vulcan 4382 1942 May 1962 Withdrawn due to collision damage1959 64 30064 Vulcan 4432 1943 July 1967 Preserved1968 65 30065 DS 237 Vulcan 4441 1943 August 1965 Preserved1279 66 30066 DS 235 Vulcan 4377 1942 August 1965 1282 67 30067 Vulcan 4380 1942 July 1967 1971 68 30068 Vulcan 4444 1943 June 1964 1952 69 30069 Vulcan 4425 1943 July 1967 1960 70 30070 DS 238 Vulcan 4433 1943 October 1962 Preserved1966 71 30071 Vulcan 4439 1943 July 1967 1973 72 30072 Vulcan 4446 1943 July 1967 Preserved1974 73 30073 Vulcan 4437 1943 December 1966 4326 74* 30074 DS 236 Vulcan 4488 1943 August 1965 Never carried SR number