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Record: 71951 (21/04/2026)
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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 |
|
| 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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