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Midland class 3
Great Britain | 1900 | 80 produced
Locomotive Magazine, September 1905

For the increased weight of express trains at the turn of the century, Johnson developed the class 3 with the 4-4-0 wheel arrangement. It was the first locomotive on the Midland Railway to have a Belpaire firebox, which increased its heating surface and therefore also power. Between 1900 and 1905, 80 were built, of which the last 15 received a slightly larger boiler.

Between 1913 and 1926, 73 of the locomotives received a new standard boiler with superheater. The remaining seven remained in use without superheaters until 1925 or 1926. Number 714 was destroyed in the Charfield accident in October 1928, in which 16 people died and 41 were injured. The decommissioning of the remaining ones began in 1935 and was not completed until 1953, when the last ones had already been taken over by the British Railways.

General
Built1900-1905
ManufacturerDerby
Axle config4-4-0 (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase22 ft 5 in
Fixed wheelbase9 ft 6 in
Total wheelbase47 ft 4 in
Service weight116,200 lbs
Adhesive weight77,504 lbs
Total weight233,492 lbs
Axle load40,936 lbs
Water capacity5,404 us gal
Fuel capacity8,960 lbs (coal)
Power
Power sourcesteam
Estimated power850 hp (634 kW)
Optimal speed29 mph
Starting effort18,674 lbf
Power Plant
Driver diameter81 in
Boiler pressure180 psi
Expansion typesimple
Cylinderstwo, 19 1/2 x 26 in
Boiler
Grate area25 sq ft
Firebox area145 sq ft
Tube heating area1,374 sq ft
Evaporative heating area1,519 sq ft
Total heating area1,519 sq ft
Calculated Values
steam locomotive
express
Samuel Waite Johnson
last changed: 01/2024
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