loco-info.com - Canadian National class U-1-a and U-1-b

U-1-a No. 6015 in Jasper, Alberta

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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.

Variant	U-1a, b Robinson superheater	U-1b Schmidt superheater

General
Built	1923	1924
Manufacturer	Canadian Locomotive Co.
Axle config	4-8-2 (Mountain)
Gauge	4 ft 8 1/2 in (Standard gauge)

Dimensions and Weights
Length	90 ft 4 1/4 in
Wheelbase	41 ft 9 in
Rigid wheelbase	19 ft 6 in
Total wheelbase	79 ft 2 in
Service weight	354,300 lbs	355,570 lbs
Adhesive weight	235,390 lbs	233,790 lbs
Total weight	595,050 lbs	603,870 lbs
Water capacity	10,000 us gal
Fuel capacity	34,000 lbs (coal)

Boiler
Grate area	66.8 sq ft
Firebox area	319 sq ft
Tube heating area	3,730 sq ft
Evaporative heating area	4,049 sq ft
Superheater area	810 sq ft	1,057 sq ft
Total heating area	4,859 sq ft	5,106 sq ft

Variant	U-1a, b Robinson superheater	U-1b Schmidt superheater

Power Plant
Driver diameter	73 in
Boiler pressure	210 psi
Expansion type	simple
Cylinders	two, 26 x 30 in

Power
Power source	steam
Estimated power	3,100 hp (2,312 kW)	3,200 hp (2,386 kW)
Starting effort	49,589 lbf

Calculated Values
Factor of adhesion	1 : 4.75	1 : 4.72
Optimal speed	40 mph	41 mph
Power-to-weight ratio	0.0088 hp/lb	0.0090 hp/lb
Heating Area Equivalent	7,264 sq ft	7,758 sq ft
Cylinder volume/HAE	1 : 773.54	1 : 724.28
Adhesive weight/Total	1 : 1.51	1 : 1.52
Tractive force/Heating area	1 : 2294.30	1 : 2183.32
Grate area/Heating area	1 : 68.00	1 : 71.70
Firebox/Tube area	1 : 14.23	1 : 15.01
Total/Superheater	1 : 5.00	1 : 3.83

steam locomotive

passenger

express

last changed: 11/2024

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