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Record: 71951 (21/04/2026)
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LNER Thompson "B1" Class 4-6-0


Class Types
LNER Class B1

General
Designer Edward Thompson
Introduced 1942
Grouping Company London and North Eastern Railway
Description (1957) Class B1. Thompson general purpose 2-cylinder 4-6-0's with 6'2" wheels built between 1942-50. They replaced G.N.R., G.C.R., and N.E.R. Atlantics, various G.C.R. 4-6-0 classes, and 4-4-0's from all of the constituent L.N.E.R. companies. No. 61057 was scrapped in 1950 after a collision at Chelmsford.
Wheel Arrangement 4-6-0
Number Built as B1 410
Number Scrapped 408
Number Preserved 2
First in Service 12/12/1942
Last in Service 30/09/1967
Manufacturers
ManufacturerTotal
Darlington Works 60
Gorton Works 10
North British Locomotive Company, Glasgow 290
Vulcan Foundry 50
Orders
BuilderSponsorOrder #DateSize
Darlington Works  n/a 08/1942 10
Darlington Works  n/a 05/1944 30
North British Locomotive Company, Glasgow (Unknown)  L958 08/1945 100
Vulcan Foundry  2333 01/1946 50
North British Locomotive Company, Glasgow (Unknown)  L963 01/1946 150
Darlington Works  n/a 11/1947 10
Gorton Works  n/a 12/1947 10
North British Locomotive Company, Glasgow (Unknown)  L997 09/1948 40
Darlington Works  n/a 02/1949 10

Illustration
Copyright: Unknown - please contact me if you know the copyright holder
Power
Variant Introduced 1942
Tractive Effort 26,878lbs
Outside Cylinders 20" x 26" (2 off)
Outside Valves 10"Piston
Outside Motion Walschaerts

Wheels
Pony 3' 2"
Drivers 6' 2"
Locomotive Wheelbase 28'
Tender Wheelbase 13' 6"
Descriptive Wheelbase 6' 3" + 5' 6" + 7' 3" + 9' 0" (engine only)

Dimensions
Length (over buffers) 61' 77⁄8"
Weight (in running order) 123t 3cwt
Weight (loco only) 71t 3cwt
Adhesive Weight 52t 10cwt
Maximum Axle Load 17t 15cwt
Water Capacity 4,200gal
Coal Capacity 7t 10cwt

Boiler & Firebox
Boiler Diagram 100A
Boiler Max Diameter 5' 6"
Boiler Barrel Length 13' 117⁄8"
Boiler Pressure 225lbs
Boiler Pitch 8' 9"
Firebox Length 9'
Firebox Grate Area 27.9ft2
Firebox Heating Surface 168ft2
Tube Number 141
Tube Diameter 2"
Tube Area 1033ft2
Flue Elements 24
Flue Diameter 51⁄4"
Flue Area 460ft2
Total Evaporative Area 1661ft2
Superheater Elements 24
Superheater Element Diameter 1.244"
Superheater Element Area 344ft2