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Canadian National class U-2
For mixed service with freight, passenger and express trains, the Canadian National procured locomotives with the wheel arrangement 4-8-4 for the first time in 1927, known in English-speaking countries as “Northern”. ...
| Canadian National class U-2Remove | |
|---|---|
| Variant | U-2a, b |
| Built | 1927 |
| Manufacturers | Canadian Locomotive Co.;Montreal Locomotive Works |
| Wheel arrangement | 2D2 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 179800 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Canadian National class U-2U-2a, b |
|---|---|
| Built | 1927 |
| Manufacturers | Canadian Locomotive Co., Montreal Locomotive Works |
| Wheel arrangement | 4-8-4 (Northern) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Canadian National class U-2U-2a, b |
|---|---|
| Wheelbase | 13.36 m |
| Total wheelbase | 25.12 m |
| Service mass | 179.8 t |
| Adhesion mass | 107.7 t |
| Total mass | 301.6 t |
| Rigid wheelbase | 5.94 m |
| Water capacity | 52,735 l |
| Fuel capacity | 18.3 t (coal) |
Boiler
| Property | Canadian National class U-2U-2a, b |
|---|---|
| Grate area | 7.841 m² |
| Firebox surface | 40.134 m² |
| Tube heating surface | 354.147 m² |
| Evaporative heating surface | 394.281 m² |
| Superheater surface | 170.942 m² |
| Total heating surface | 565.2 m² |
Power plant
| Property | Canadian National class U-2U-2a, b |
|---|---|
| Driver diameter | 1,854 mm |
| Boiler pressure | 17.2 bar |
| Expansion type | simple expansion |
| Cylinders | two, 648 x 762 mm |
Power
| Property | Canadian National class U-2U-2a, b |
|---|---|
| Power source | steam |
| Estimated power | 2,983 kW (4,056 PS) |
| Starting effort | 252.6 kN |
Calculated values
| Property | Canadian National class U-2U-2a, b |
|---|---|
| Factor of adhesion | 1 : 4.18 |
| Optimal speed | 72 km/h |
| Power-to-weight ratio | 16.6 kW/t |
| Heating Surface Equivalent | 936.8 m² |
| Cylinder volume/HSE | 1 : 535.99 |
| Adhesive weight/Total | 1 : 1.67 |
| Tractive force/Heating surface | 1 : 9.33 |
| Grate area/Heating surface | 1 : 72.09 |
| Firebox/Tube surface | 1 : 8.82 |
| Total/Superheater | 1 : 2.31 |
