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Steam
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Page views since 2023-01-26: 2128993
Canadian National class U-1-a and U-1-b
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Canada | 1923
37 produced
U-1-a No. 6015 in Jasper, Alberta
U-1-a No. 6015 in Jasper, Alberta
Zeitlupe

The classes U-1-a and U-1-b of the Canadian National consisted of a total of 37 Mountains with a driver diameter of 73 inches. The a and b subclasses were essentially identical, but U-1-a designated the 16 locomotives built in 1923 and U-1-b designated the 21 built in 1924. All U-1-a and some U-1-b were built with a Robinson superheater, while the rest got one of the Schmidt design. Later, more were rebuilt to the Schmidt variant. They were retired between 1951 and 1962. Today, only U-1-a is still existing and on display at Jasper, Alberta. So far there is only a short text for this vehicle. In the future it will be described in more detail.

VariantU-1a, b Robinson superheaterU-1b Schmidt superheater
General
Built19231924
ManufacturerCanadian Locomotive Co.
Axle config4-8-2 (Mountain) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length90 ft 4 1/4 in
Wheelbase41 ft 9 in
Rigid 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)
Boiler
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
VariantU-1a, b Robinson superheaterU-1b Schmidt superheater
Power Plant
Driver diameter73 in
Boiler pressure210 psi
Expansion typesimple
Cylinderstwo, 26 x 30 in
Power
Power sourcesteam
Estimated power3,100 hp (2,312 kW)3,200 hp (2,386 kW)
Starting effort49,589 lbf
Calculated Values
Optimal speed40 mph41 mph
steam locomotive
passenger
express
last changed: 11/2024
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