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Record: 71951 (21/04/2026)
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MR/LMS Johnson "25" 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 25 18
First in Service 1887
Last in Service 09/1928
Manufacturers
ManufacturerTotal
Derby Works 18
Orders
BuilderSponsorOrder #DateSize
Derby Works  655 1887 5
Derby Works  745 12/1888 3
Derby Works  796 1889 5
Derby Works  809 1889 5

Power
Variant Introduced 1887
Inside Cylinders 18" x 26" (2 off)
Inside Valves Slide

Wheels
Pony 3' 6"
Drivers 7' 4"
Truck 4' 21⁄2"
Locomotive Wheelbase 21' 91⁄2"
Descriptive Wheelbase 6' 0" + 7' 0½" + 8' 9" = 21' 9½" (engine only)

Dimensions
Weight (in running order) 43t 5cwt

Boiler & Firebox
Boiler Diagram D
Boiler Max Diameter 4' 1"
Boiler Barrel Length 10' 4"
Boiler Pressure 160lbs
Firebox Type Round Top
Firebox Length 6' 6"
Total Evaporative Area 1223ft2
Total Heating Area 1223ft2