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Record: 10235 (26/09/2023)
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MR/LMS Johnson "179" Class 4-2-2


General
Designer Samuel Johnson
Introduced 1893
Pre-Grouping Company Midland Railway
Grouping Company London, Midland & Scottish Railway
Wheel Arrangement 4-2-2
Number Built as 179 10
First in Service 1893
Last in Service 04/1927
Manufacturers
ManufacturerTotal
Derby Works 10
Orders
BuilderSponsorOrder #DateSize
Derby Works  1124 1893 5
Derby Works  1454 1896 5

Power
Variant Introduced 1893
Inside Cylinders 18.5" x 26" (2 off)
Inside Valves Piston

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

Dimensions
Weight (in running order) 44t 3cwt

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