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Record: 71951 (21/04/2026)
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MR/LMS Johnson "1667" Class 4-4-0


General
Designer Samuel Johnson
Introduced 1884
Pre-Grouping Company Midland Railway
Grouping Company London, Midland & Scottish Railway
Wheel Arrangement 4-4-0
Number Built as 1667 10
Conversions to other classes 10
First in Service 1884
Last in Service 01/1961
Manufacturers
ManufacturerTotal
Derby Works 10
Orders
BuilderSponsorOrder #DateSize
Derby Works  444 1884 10

Power
Variant Introduced 1884
Inside Cylinders 19" x 26" (2 off)
Inside Motion Joy

Wheels
Pony 3' 6"
Drivers 7'
Locomotive Wheelbase 21' 6"
Descriptive Wheelbase 6' 0" + 7' 0" + 8' 6" = 21' 6" (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 134"
Tube Area 1123ft2
Total Evaporative Area 1233ft2
Total Heating Area 1233ft2