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Record: 71951 (21/04/2026)
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LNER Peppercorn "A1" Class 4-6-2
Class Types
| LNER Class |
A1 |
General
| Designer |
Arthur Peppercorn |
| Introduced |
1948 |
| Grouping Company |
London and North Eastern Railway |
| Description (1957) |
Class A1, a slightly modified version of class A1/1, built by Mr. A. H. Peppercorn in 1948 and 1949. 6'8" wheels, 250 lbs. pressure, 3 cylinders, 19 x 26 ins. |
| Wheel Arrangement |
4-6-2 |
| Number Built as A1 |
50 |
| Number Scrapped |
49 |
| Number Preserved |
1 |
| First in Service |
06/08/1948 |
| Last in Service |
19/06/1966 |
| Manufacturers |
|
| Orders |
|
|
|
|
Power
|
Standard |
Timken |
| Variant Introduced |
1948 |
1949 |
| Miscellaneous Differences |
|
Timken Roller Bearings |
| Tractive Effort |
37,397lbs |
As Standard |
| Inside Cylinders |
19" x 26" (1 off) |
As Standard |
| Inside Valves |
10"Piston |
As Standard |
| Inside Motion |
Walschaerts |
As Standard |
| Outside Cylinders |
19" x 26" (2 off) |
As Standard |
| Outside Valves |
10"Piston |
As Standard |
| Outside Motion |
Walschaerts |
As Standard |
Wheels
|
Standard |
Timken |
| Pony |
3' 2" |
As Standard |
| Drivers |
6' 8" |
As Standard |
| Truck |
3' 8" |
As Standard |
| Locomotive Wheelbase |
36' 3" |
As Standard |
| Tender Wheelbase |
16' |
As Standard |
| Total Wheelbase |
62' 51⁄4" |
As Standard |
| Descriptive Wheelbase |
6' 3" + 5' 9" + 7' 3" + 7' 3" + 9' 9" + 10 2¼" + 5' 3" + 5' 6" + 5' 3" = 62 5¼" |
As Standard |
Dimensions
|
Standard |
Timken |
| Length (over buffers) |
72' 113⁄4" |
As Standard |
| Weight (in running order) |
164t 9cwt |
166t 2cwt |
| Weight (loco only) |
104t 2cwt |
105t 4cwt |
| Adhesive Weight |
66t 0cwt |
66t 11cwt |
| Maximum Axle Load |
22t 0cwt |
22t 7cwt |
| Water Capacity |
5,000gal |
As Standard |
| Coal Capacity |
9t 0cwt |
As Standard |
Boiler & Firebox
|
Standard |
Timken |
| Boiler Diagram |
118 |
As Standard |
| Boiler Max Diameter |
6' 5" |
As Standard |
| Boiler Barrel Length |
16' 115⁄8" |
As Standard |
| Boiler Pressure |
250lbs |
As Standard |
| Boiler Pitch |
9' 41⁄2" |
As Standard |
| Firebox Type |
Belpaire |
As Standard |
| Firebox Length |
11' 41⁄8" |
As Standard |
| Firebox Grate Area |
50ft2 |
As Standard |
| Firebox Heating Surface |
245.3ft2 |
As Standard |
| Tube Number |
121 |
As Standard |
| Tube Diameter |
21⁄4" |
As Standard |
| Tube Area |
1211.57ft2 |
As Standard |
| Flue Elements |
43 |
As Standard |
| Flue Diameter |
51⁄4" |
As Standard |
| Flue Area |
1004.5ft2 |
As Standard |
| Total Evaporative Area |
2461.37ft2 |
As Standard |
| Superheater Elements |
43 |
As Standard |
| Superheater Element Diameter |
1.244" |
As Standard |
| Superheater Element Area |
679.67ft2 |
As Standard |
| Total Heating Area |
3141.04ft2 |
As Standard |
|
