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Record: 71951 (21/04/2026)
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MR/LMS Johnson "115" Class 4-2-2


General
Designer Samuel Johnson
Pre-Grouping Company Midland Railway
Grouping Company London, Midland & Scottish Railway
Wheel Arrangement 4-2-2
Number Built as 115 15
First in Service 11/1896
Last in Service 04/1928
Manufacturers
ManufacturerTotal
Derby Works 15
Orders
BuilderSponsorOrder #DateSize
Derby Works  1?74 11/1896 5
Derby Works  1659 1899 10

Power
Variant Introduced 1896
Inside Cylinders 19.5" x 26" (2 off)
Inside Valves Piston

Wheels
Pony 3' 6"
Drivers 7' 9"
Truck 4' 4"
Locomotive Wheelbase 21' 111⁄2"
Descriptive Wheelbase 6' 0" + 7' 2½" + 9' 0" = 21' 11½" (engine only)

Dimensions
Weight (in running order) 47t 2cwt

Boiler & Firebox
Boiler Diagram E
Boiler Max Diameter 4' 1"
Boiler Barrel Length 10' 6"
Boiler Pressure 170lbs
Firebox Type Round Top
Firebox Length 7'
Total Evaporative Area 1233ft2
Total Heating Area 1233ft2