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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 |
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Orders |
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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' 105⁄8" |
Descriptive Wheelbase |
6' 3" + 5' 6" + 7' 3" + 7' 3" + 9' 6" Loco only (different tenders used) |
Dimensions
Length (over buffers) |
70' 51⁄8" |
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' 41⁄2" |
Firebox Type |
Round Top |
Firebox Length |
9' 51⁄2" |
Firebox Grate Area |
41.25ft2 |
Firebox Heating Surface |
215ft2 |
Tube Number |
168 |
Tube Diameter |
21⁄4" |
Tube Area |
1880ft2 |
Flue Elements |
32 |
Flue Diameter |
51⁄4" |
Flue Area |
835ft2 |
Total Evaporative Area |
2930ft2 |
Superheater Elements |
32 |
Superheater Element Diameter |
11⁄4" |
Superheater Element Area |
525ft2 |
Total Heating Area |
3455ft2 |
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