LNER Thompson Class B1

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LNER Thompson Class B1
61059 at Norwich Thorpe, January 1958.
Type and origin Power type Steam Designer Edward Thompson Builder Darlington Works (60) Gorton Works (10) North British Locomotive Co. (290) Vulcan Foundry (50) Build date 1942–1952 Total produced 410
Specifications Configuration: ​  • Whyte 4-6-0  • UIC 2′C h2 Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Leading dia. 3 ft 2 in (0.965 m) Driver dia. 6 ft 2 in (1.880 m) Axle load 17 long tons 15 cwt (39,800 lb or 18 t) Loco weight 71 long tons 3 cwt (159,400 lb or 72.3 t) Fuel type Coal Boiler LNER diagram 100A Boiler pressure 225 psi (1.55 MPa) Cylinders Two, outside Cylinder size 20 in × 26 in (508 mm × 660 mm) Valve gear Walschaerts Valve type 10-inch (254 mm) piston valves
Performance figures Tractive effort 26,878 lbf (119.56 kN)
Career Operators LNER » BR Class LNER: B1 Power class BR: 5MT Numbers LNER:1000-1409,BR : 61000-61409 Nicknames Bongos, Antelopes Axle load class Route Availability 5 Locale Eastern Region North Eastern Region Scottish Region Withdrawn 1961–1967 Preserved (6)1264, 61306 Disposition Two preserved, remainder scrapped

The London and North Eastern Railway (LNER) Thompson Class B1 is a class of steam locomotive designed by Edward Thompson for medium mixed traffic work.^[1]