SR USA class

Specifications
Specifications
Configuration:;
• Whyte	0-6-0T
• UIC	C n2t
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	55.2 in (1.402 m)
Wheelbase	10 ft 0 in (3.05 m)
Length	29 ft 8 in (9.04 m)
Loco weight	46 long tons 10 cwt (47.2 t; 52.1 short tons)
Fuel type	Coal
Fuel capacity	17.8 short hundredweight (0.81 t; 0.79 long tons)
Water cap.	1,000 imp gal (4,500 L; 1,200 US gal)
Boiler pressure	210 psi (1.45 MPa)
Cylinders	Two, outside
Cylinder size	16+1⁄2 in × 24 in (419 mm × 610 mm)
Valve gear	Walschaerts
Valve type	8 in (203 mm) piston valves

Type and origin
Type and origin
Power type	Steam
Designer	Col. Howard G. Hill.
Builder	Vulcan Iron Works, USA (13); H. K. Porter, Inc., USA (2);
Model	S100
Build date	1942-43

Southern Railway USA class
Southern Railway USA class
	USA class locomotive No. 30073 at Eastleigh MPD in August 1966.
Power type
Type and origin
Power type	Steam
Designer	Col. Howard G. Hill.
Builder	Vulcan Iron Works, USA (13); H. K. Porter, Inc., USA (2);
Model	S100
Build date	1942-43
Configuration:;
Specifications
Configuration:;
• Whyte	0-6-0T
• UIC	C n2t
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	55.2 in (1.402 m)
Wheelbase	10 ft 0 in (3.05 m)
Length	29 ft 8 in (9.04 m)
Loco weight	46 long tons 10 cwt (47.2 t; 52.1 short tons)
Fuel type	Coal
Fuel capacity	17.8 short hundredweight (0.81 t; 0.79 long tons)
Water cap.	1,000 imp gal (4,500 L; 1,200 US gal)
Boiler pressure	210 psi (1.45 MPa)
Cylinders	Two, outside
Cylinder size	16+1⁄2 in × 24 in (419 mm × 610 mm)
Valve gear	Walschaerts
Valve type	8 in (203 mm) piston valves
Tractive effort
Performance figures
Tractive effort	21,630 lbf (96.22 kN)
Operators
Career
Operators	Southern Railway; British Railways;
Class	SR: USA
Power class	BR: 3F
Number in class	14 (plus one bought for spares)
Nicknames	Yank Tanks
Locale	Southampton Docks
Withdrawn	1962–1967
Preserved	30064, 30065, 30070, 30072, others of base S100 class
Disposition	Four preserved, remainder scrapped
	Sources: and

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".

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