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Record: 10235 (26/09/2023)
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LNER Thompson "A2" Class 4-6-2


Class Types
LNER Class A2

General
Designer Edward Thompson
Introduced 1944
Grouping Company London and North Eastern Railway
Description (1957) 60507-60510 Class A2/1, 6'2" Pacifics, built in 1944, a development of V2 class (see 60800) with leading bogie. 225 lbs. pressure, 3 cylinders, 19 X 26 ins.

60501-60506 Class A2/2, originally built in 1934-36 as 2-8-2's for service between Edinburgh and Aberdeen. Rebuilt in 1943-44 by Thompson as Pacifics. 6'2" wheels, 225 lbs. pressure, 3 cylinders, 20 X 26 ins.

60500, 60511-60524 Class A2/3, Thompson 6'2" Pacifics, built 1946-47. 250 lbs. pressure, 3 cylinders, 16 X 26 ins.
Wheel Arrangement 4-6-2
Number Built as A2 19
Number Scrapped 25
First in Service 13/05/1944
Last in Service 19/06/1965
Manufacturers
ManufacturerTotal
Doncaster Works 21
Darlington Works 4
Orders
BuilderSponsorOrder #DateSize
Darlington Works  n/a 12/1943 4
Doncaster Works  378 06/1944 10
Doncaster Works  379 06/1944 5

Power
A2/1 A2/2 A2/3
Variant Introduced 1944 1943 1946
Tractive Effort 36,387lbs
As A2/1
As A2/1
Inside Cylinders 19" x 26" (1 off)
As A2/1
As A2/1
Inside Valves 10"Piston
As A2/1
As A2/1
Inside Motion Walschaerts
As A2/1
As A2/1
Outside Cylinders 19" x 26" (2 off)
As A2/1
As A2/1
Outside Valves 10"Piston
As A2/1
As A2/1
Outside Motion Walschaerts
As A2/1
As A2/1

Wheels
A2/1 A2/2 A2/3
Pony 3' 2"
As A2/1
As A2/1
Drivers 6' 2"
As A2/1
As A2/1
Truck 3' 8"
As A2/1
As A2/1
Locomotive Wheelbase 36' 8"
As A2/1
As A2/1
Tender Wheelbase 16'
As A2/1
As A2/1
Total Wheelbase 61' 958"
As A2/1
As A2/1
Descriptive Wheelbase 6' 3" + 8' 2" + 6' 6" + 6' 6" + 9' 3" + ? + 5' 3" + 5' 6" + 5' 3" = 61' 9⅝"
As A2/1
As A2/1

Dimensions
A2/1 A2/2 A2/3
Length (over buffers) 71' 518"
As A2/1
As A2/1
Weight (in running order) 60t 7cwt
As A2/1
As A2/1
Weight (loco only) 98t 0cwt
As A2/1
As A2/1
Adhesive Weight 66t 0cwt
As A2/1
As A2/1
Maximum Axle Load 22t 0cwt
As A2/1
As A2/1
Water Capacity 5,000gal
As A2/1
As A2/1
Coal Capacity 9t 0cwt
As A2/1
As A2/1

Boiler & Firebox
A2/1 A2/2 A2/3
Boiler Diagram 109
As A2/1
As A2/1
Boiler Max Diameter 6' 5"
As A2/1
As A2/1
Boiler Barrel Length 17'
As A2/1
As A2/1
Boiler Pressure 225lbs
As A2/1
As A2/1
Firebox Type Belpaire
As A2/1
As A2/1
Firebox Length 9' 534"
As A2/1
As A2/1
Firebox Grate Area 41.25ft2
As A2/1
As A2/1
Firebox Heating Surface 215ft2
As A2/1
As A2/1
Tube Number 121
As A2/1
As A2/1
Tube Diameter 214"
As A2/1
As A2/1
Tube Area 1211.57ft2
As A2/1
As A2/1
Flue Elements 42
As A2/1
As A2/1
Flue Diameter 514"
As A2/1
As A2/1
Flue Area 1044.5ft2
As A2/1
As A2/1
Total Evaporative Area 2431.07ft2
As A2/1
As A2/1
Superheater Elements 43
As A2/1
As A2/1
Superheater Element Diameter 1.244"
As A2/1
As A2/1
Superheater Element Area 679.67ft2
As A2/1
As A2/1
Total Heating Area 3110.74ft2
As A2/1
As A2/1