The reference for locomotives and railcars


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Canadian National class U-1a and U-1b
Canada | 1923 | 36 produced
U-1a No. 6015 in Jasper, Alberta
U-1a No. 6015 in Jasper, Alberta
VariantU-1a, b Robinson superheaterU-1b Schmidt superheater
ManufacturerCanadian Locomotive Co.
Axle config4-8-2 (Mountain) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase41 ft 9 in
Fixed wheelbase19 ft 6 in
Total wheelbase79 ft 2 in
Service weight354,300 lbs355,570 lbs
Adhesive weight235,390 lbs233,790 lbs
Total weight595,050 lbs603,870 lbs
Water capacity10,000 us gal
Fuel capacity34,000 lbs (coal)
Power sourcesteam
Estimated power3,100 hp (2,312 kW)3,200 hp (2,386 kW)
Optimal speed40 mph41 mph
Starting effort49,589 lbf
Power Plant
Driver diameter73 in
Boiler pressure210 psi
Expansion typesimple
Cylinderstwo, 26 x 30 in
Grate area66.8 sq ft
Firebox area319 sq ft
Tube heating area3,730 sq ft
Evaporative heating area4,049 sq ft
Superheater area810 sq ft1,057 sq ft
Total heating area4,859 sq ft5,106 sq ft
Calculated Values
steam locomotive
last changed: 10 2023

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