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Record: 12282 (30/03/2025)
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MR/LMS Johnson "1738" Class 4-4-0
General
Designer |
Samuel Johnson |
Introduced |
1885 |
Pre-Grouping Company |
Midland Railway |
Grouping Company |
London, Midland & Scottish Railway |
Wheel Arrangement |
4-4-0 |
Number Built as 1738 |
20 |
Conversions to other classes |
5 |
First in Service |
1885 |
Last in Service |
12/1956 |
Manufacturers |
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Orders |
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Power
Variant Introduced |
1885 |
Inside Cylinders |
18" x 26" (2 off) |
Wheels
Pony |
3' 6" |
Drivers |
7' 01⁄2" |
Locomotive Wheelbase |
21' 61⁄2" |
Descriptive Wheelbase |
6' 0" + 7' 0½" + 8' 6" = 21' 6½" (engine only) |
Dimensions
Weight (loco only) |
43t 0cwt |
Boiler & Firebox
Boiler Diagram |
B(b) |
Boiler Max Diameter |
4' 1" |
Boiler Barrel Length |
10' 6" |
Boiler Pressure |
160lbs |
Firebox Type |
Round Top |
Firebox Length |
5' 11" |
Firebox Grate Area |
17.5ft2 |
Firebox Heating Surface |
110ft2 |
Tube Number |
223 |
Tube Diameter |
13⁄4" |
Tube Area |
1123ft2 |
Total Evaporative Area |
1233ft2 |
Total Heating Area |
1233ft2 |
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