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Record: 10235 (26/09/2023)
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MR/LMS Johnson "483" Class 4-4-0


General
Designer Samuel Johnson
Rebuilt By Fowler
Introduced 1912
Pre-Grouping Company Midland Railway
Grouping Company London, Midland & Scottish Railway
Wheel Arrangement 4-4-0
Number Built as 483 0
Conversions from other classes 157
Manufacturers
ManufacturerTotal
Derby Works 94
Sharp Stewart 48
Beyer Peacock Ltd. 5
Neilson, Reid & Co. 10

Power
Variant Introduced 1912
Inside Cylinders 20.5" x 26" (2 off)

Wheels
Pony 3' 61⁄2"
Drivers 7' 01⁄2"
Locomotive Wheelbase 22' 81⁄2"
Descriptive Wheelbase 6' 0" + 7' 2½" + 9' 6" = 22' 8½" (engine only)

Dimensions
Weight (loco only) 53t 7cwt

Boiler & Firebox
Boiler Diagram G7S
Boiler Max Diameter 4' 8"
Boiler Barrel Length 10' 6"
Boiler Pressure 180lbs
Firebox Type Belpaire
Firebox Length 7'
Total Evaporative Area 1170ft2
Superheater Element Area 313ft2
Total Heating Area 1483ft2