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Record: 10235 (26/09/2023)
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GNR/LNER Gresley "A1" Class 4-6-2


General
Designer Sir Nigel Gresley
Introduced 1922
Pre-Grouping Company Great Northern Railway
Grouping Company London and North Eastern Railway
Wheel Arrangement 4-6-2
Number Built as A1 52
Conversions to other classes 52
First in Service 11/04/1922
Last in Service 17/01/1966
Manufacturers
ManufacturerTotal
Doncaster Works 32
North British Locomotive Company, Glasgow 20
Orders
BuilderSponsorOrder #DateSize
Doncaster Works  293 01/1921 2
Doncaster Works  297 07/1922 10
Doncaster Works  301 10/1923 10
Doncaster Works  302 10/1923 10
North British Locomotive Company, Glasgow (Hyde Park)  L787 12/1923 20

Power
Variant Introduced 1922
Tractive Effort 29,835lbs
Inside Cylinders 20" x 26" (1 off)
Inside Valves 8"Piston
Inside Motion Gresley
Outside Cylinders 20" x 26" (2 off)
Outside Valves 8"Piston
Outside Motion Walschaerts

Wheels
Pony 3' 2"
Drivers 6' 8"
Truck 3' 8"
Locomotive Wheelbase 35' 9"
Total Wheelbase 60' 1058"
Descriptive Wheelbase 6' 3" + 5' 6" + 7' 3" + 7' 3" + 9' 6"
Loco only (different tenders used)

Dimensions
Length (over buffers) 70' 518"
Weight (in running order) 147t 15cwt
Weight (loco only) 92t 9cwt
Adhesive Weight 60t 0cwt
Maximum Axle Load 20t 0cwt
Water Capacity 5,000gal
Coal Capacity 8t 0cwt

Boiler & Firebox
Boiler Diagram 94
Boiler Max Diameter 6' 5"
Boiler Barrel Length 19'
Boiler Pressure 180lbs
Boiler Pitch 9' 412"
Firebox Type Round Top
Firebox Length 9' 512"
Firebox Grate Area 41.25ft2
Firebox Heating Surface 215ft2
Tube Number 168
Tube Diameter 214"
Tube Area 1880ft2
Flue Elements 32
Flue Diameter 514"
Flue Area 835ft2
Total Evaporative Area 2930ft2
Superheater Elements 32
Superheater Element Diameter 114"
Superheater Element Area 525ft2
Total Heating Area 3455ft2