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Record: 71951 (21/04/2026)
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MR/LMS Johnson "4P" Class 4-4-0
General
| Designer |
Samuel Johnson |
| Introduced |
1902 |
| Pre-Grouping Company |
Midland Railway |
| Grouping Company |
London, Midland & Scottish Railway |
| Wheel Arrangement |
4-4-0 |
| Number Built as 4P |
45 |
| Number Preserved |
1 |
| First in Service |
01/1902 |
| Last in Service |
01/1953 |
| Manufacturers |
|
| Orders |
|
|
|
|
Power
|
2631 |
|
|
| Variant Introduced |
1902 |
As 2631 |
As 2631 |
| Miscellaneous Differences |
|
(1005 series) |
(1035 series) |
| Inside Cylinders |
19" x 26" (1 off) |
As 2631 |
As 2631 |
| Inside Motion |
Stephenson |
As 2631 |
As 2631 |
| Outside Cylinders |
21" x 26" (2 off) |
As 2631 |
As 2631 |
| Outside Motion |
Stephenson |
As 2631 |
As 2631 |
Wheels
|
2631 |
|
|
| Pony |
3' 61⁄2" |
As 2631 |
As 2631 |
| Drivers |
7' |
As 2631 |
As 2631 |
| Locomotive Wheelbase |
24' 3" |
As 2631 |
24' 41⁄2" |
| Descriptive Wheelbase |
6' 6" + 8' 3" + 9' 6 = 24' 3" (engine only) |
As 2631 |
6' 7½" + 8' 3" + 9' 6" = 24' 4½" (engine only) |
Dimensions
|
2631 |
|
|
| Weight (loco only) |
59t 10cwt |
59t 16cwt |
As 2631 |
Boiler & Firebox
|
2631 |
|
|
| Boiler Diagram |
G8½ |
G9 |
As 2631 |
| Boiler Max Diameter |
4' 8" |
4' 8" |
As 2631 |
| Boiler Barrel Length |
11' 7" |
11' 11" |
As 2631 |
| Boiler Pressure |
200lbs |
220lbs |
As 2631 |
| Firebox Type |
Belpaire |
Belpaire |
As 2631 |
| Firebox Length |
8' 6" |
9' |
As 2631 |
| Total Evaporative Area |
1598ft2 |
1473ft2 |
As 2631 |
| Total Heating Area |
1598ft2 |
1473ft2 |
As 2631 |
|