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Soo Line class N-20
These updated USRA Light Mountains were built to accelerate freight traffic on a single track main line. The first ten were built by ALCO-Brooks in 1926, eight more in 1928 by ALCO in Schenectady, and the last three i...
General
| Property | Soo Line class N-20Remove |
|---|---|
| Built | 1926-1930 |
| Manufacturers | ALCO, Shoreham |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Soo Line class N-20Remove |
|---|---|
| Length | 26.94 m |
| Wheelbase | 12.45 m |
| Rigid wheelbase | 5.56 m |
| Service weight | 155.1 t |
| Adhesive weight | 105 t |
| Axle load | 26.3 t |
| Total weight | 233.1 t |
| Water capacity | 45,425 l |
| Fuel capacity | 15.9 t (coal) |
Boiler
| Property | Soo Line class N-20Remove |
|---|---|
| Grate area | 6.531 m² |
| Firebox surface | 31.68 m² |
| Tube heating surface | 320.33 m² |
| Evaporative heating surface | 352.01 m² |
| Superheater surface | 102.472 m² |
| Total heating surface | 454.5 m² |
Power plant
| Property | Soo Line class N-20Remove |
|---|---|
| Driver diameter | 1,753 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 686 x 762 mm |
Power
| Property | Soo Line class N-20Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,424 kW (3,296 PS) |
| Starting effort | 239.7 kN |
| Starting effort booster | 52.489 kN |
Calculated values
| Property | Soo Line class N-20Remove |
|---|---|
| Factor of adhesion | 1 : 4.30 |
| Optimal speed | 61 km/h |
| Power-to-weight ratio | 15.6 kW/t |
| Heating Surface Equivalent | 715.4 m² |
| Cylinder volume/HSE | 1 : 786.95 |
| Adhesive weight/Total | 1 : 1.48 |
| Tractive force/Heating surface | 1 : 11.01 |
| Grate area/Heating surface | 1 : 69.59 |
| Firebox/Tube surface | 1 : 10.11 |
| Total/Superheater | 1 : 3.44 |
