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Record: 12282 (30/03/2025)
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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 |
|
| Orders |
|
|
|
|
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' 95⁄8" |
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' 51⁄8" |
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' 53⁄4" |
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 |
21⁄4" |
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 |
51⁄4" |
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 |
|