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North Eastern class D
London & North Eastern class H1
Great Britain | 1913 | 45 produced
flickr/stratfordman72

The North Eastern Railway's class D was developed by Vincent Raven for rural passenger trains. In order to achieve equally good running characteristics in both directions of travel, he chose a tank locomotive with a 4-4-4T wheel arrangement. Three cylinders ensured smoother acceleration. Although there were only two axles available for traction, the coefficient of adhesion of more than four indicated that there was enough traction for starting without slipping.

In 1913 the first 20 were built in Darlington. Another 25 followed after the war in the years 1920 to 1922. The LNER took over the locomotives as class H1. Between 1931 and 1936, all were rebuilt to a 4-6-2T wheel arrangement. These were designated class A8 and were retired between 1957 and 1960.

General
Built1913, 1920-1922
ManufacturerDarlington
Axle config4-4-4T (Reading) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase34 ft 6 in
Fixed wheelbase8 ft
Service weight189,840 lbs
Adhesive weight89,040 lbs
Axle load44,520 lbs
Water capacity2,402 us gal
Fuel capacity8,960 lbs (coal)
Power
Power sourcesteam
Estimated power850 hp (634 kW)
Optimal speed26 mph
Starting effort20,928 lbf
Power Plant
Driver diameter69 in
Boiler pressure160 psi
Expansion typesimple
Cylindersthree, 16 1/2 x 26 in
Boiler
Grate area23 sq ft
Firebox area124 sq ft
Tube heating area935 sq ft
Evaporative heating area1,059 sq ft
Superheater area273 sq ft
Total heating area1,332 sq ft
Calculated Values
steam locomotive
passenger
tank locomotive
Sir Vincent Litchfield Raven
last changed: 04/2024
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