LNER Thompson Class L1 No. 67781 at Neasden Shed 1957
Type and origin Power type Steam Designer Edward Thompson Builder Build date 1945, 1948–1950 Total produced 100
Specifications Configuration: • Whyte 2-6-4T • UIC 1′C2′ h2t Gauge 4 ft 8+ 1 ⁄2 in (1,435 mm )Leading dia. 3 ft 2 in (0.965 m) Driver dia.5 ft 2 in (1.575 m) Trailing dia. 3 ft 2 in (0.965 m) Length 43 ft 4 in (13.21 m) Axle load 20.00 long tons (20.32 t) Adhesive weight 58.95 long tons (59.90 t) Loco weight 89.45 long tons (90.89 t) Fuel type Coal Fuel capacity 4.50 long tons (4.57 t) Water cap. 2,630 imp gal (12,000 L; 3,160 US gal) Firebox: • Grate area 24.75 sq ft (2.299 m2 ) Boiler LNER diagram 115 Boiler pressure 225 lbf/in2 (1.55 MPa), 200 lbf/in2 (1.38 MPa) Heating surface: • Firebox 138.5 sq ft (12.87 m2 ) • Tubes 830.0 sq ft (77.11 m2 ) • Flues 368.0 sq ft (34.19 m2 ) • Total surface 1,336.5 sq ft (124.16 m2 ) Superheater: • Heating area 284.0 sq ft (26.38 m2 ) Cylinders Two, outside Cylinder size 20 in × 26 in (508 mm × 660 mm), 18.75 in × 26 in (476 mm × 660 mm) on some engines Valve type 10-inch (254 mm) piston valves
Performance figures Tractive effort 32,080 lbf (142.70 kN) on most engines, between 25,063 lbf (111.49 kN) and 28,516 lbf (126.85 kN) on some engines experimentally
Career Operators Class L1 Power class BR: 4MT Numbers BR: 67701–67800 Axle load class Route Availability 7Locale Withdrawn 1960–1962 Disposition All scrapped
The London and North Eastern Railway (LNER) Thompson Class L1 was a class of 2-6-4T steam locomotives designed by Edward Thompson . The prototype no. 9000 was built in 1945, but the remaining 99 were built under British Railways jurisdiction between 1948–1950. The prototype was well received, however the production batch were not, and all were withdrawn and scrapped between 1960 and 1962.
