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Canadian National class U-1-a and U-1-b
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...
General
| Property | Canadian National class U-1-a and U-1-b U-1a, b Robinson superheater |
|---|---|
| Built | 1923 |
| Manufacturers | Canadian Locomotive Co. |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Canadian National class U-1-a and U-1-b U-1a, b Robinson superheater |
|---|---|
| Length | 27.54 m |
| Wheelbase | 12.73 m |
| Rigid wheelbase | 5.94 m |
| Total wheelbase | 24.13 m |
| Service weight | 160.7 t |
| Adhesive weight | 106.8 t |
| Total weight | 269.9 t |
| Water capacity | 37,854 l |
| Fuel capacity | 15.4 t (coal) |
Boiler
| Property | Canadian National class U-1-a and U-1-b U-1a, b Robinson superheater |
|---|---|
| Grate area | 6.203 m² |
| Firebox surface | 29.636 m² |
| Tube heating surface | 346.529 m² |
| Evaporative heating surface | 376.165 m² |
| Superheater surface | 75.252 m² |
| Total heating surface | 451.4 m² |
Power plant
| Property | Canadian National class U-1-a and U-1-b U-1a, b Robinson superheater |
|---|---|
| Driver diameter | 1,854 mm |
| Boiler pressure | 14.5 bar |
| Expansion type | simple expansion |
| Cylinders | two, 660 x 762 mm |
Power
| Property | Canadian National class U-1-a and U-1-b U-1a, b Robinson superheater |
|---|---|
| Power source | steam |
| Estimated power | 2,312 kW (3,143 PS) |
| Starting effort | 220.6 kN |
Calculated values
| Property | Canadian National class U-1-a and U-1-b U-1a, b Robinson superheater |
|---|---|
| Factor of adhesion | 1 : 4.75 |
| Optimal speed | 64 km/h |
| Power-to-weight ratio | 14.4 kW/t |
| Heating Surface Equivalent | 674.8 m² |
| Cylinder volume/HSE | 1 : 773.54 |
| Adhesive weight/Total | 1 : 1.51 |
| Tractive force/Heating surface | 1 : 10.21 |
| Grate area/Heating surface | 1 : 72.77 |
| Firebox/Tube surface | 1 : 11.69 |
| Total/Superheater | 1 : 5.00 |
