The reference for locomotives and railcars


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British Rail Standard class 7 “Britannia”
Great Britain | 1951
No 70013 “Oliver Cromwell” at Leicester North Station in June 2013
No 70013 “Oliver Cromwell” at Leicester North Station in June 2013
Varianttender BR1tender BR1D
Axle config4-6-2 (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length68 ft 9 in
Wheelbase35 ft 9 in
Fixed wheelbase14 ft
Service weight210,560 lbs
Adhesive weight137,760 lbs
Total weight320,656 lbs329,952 lbs
Axle load45,360 lbs
Water capacity5,104 us gal6,005 us gal
Fuel capacity15,680 lbs (coal)20,160 lbs (coal)
Power sourcesteam
Estimated power2,700 hp (2,013 kW)
Optimal speed54 mph
Starting effort32,162 lbf
Power Plant
Driver diameter74 in
Boiler pressure250 psi
Expansion typesimple
Cylinderstwo, 20 x 28 in
Grate area42 sq ft
Firebox area210 sq ft
Tube heating area2,475 sq ft
Evaporative heating area2,685 sq ft
Superheater area718 sq ft
Total heating area3,403 sq ft
Calculated Values
steam locomotive
last changed: 08 2023

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