Northern Pacific class S-10
United States 1905 20 produced
These 20 Ten-Wheelers were built by ALCO-Rogers for the Chicago Southern Railroad between 1905 and 1907. When this company went bankrupt, 14 locomotives had not yet been delivered. Ten of these were purchased by Northern Pacific and designated class S-10. The remaining four went to other customers.
Eight of the Southern Pacific were retired between 1928 and 1933. Only 321 and 328 remained in use on branch lines. While 321 was scrapped in 1946, 328 ran for the last time in 1948. After being restored by the Minnesota Transportation Museum, it was operational from 1981 to 2001. Today it can be found at the Jackson Street Roundhouse in St. Paul, Minnesota.
Technical data
General
- Built
- 1905-1907
- Manufacturers
- ALCO
- Wheel arrangement
- 4-6-0 (Ten-wheeler)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Length
- 17.83 m
- Wheelbase
- 8.87 m
- Total wheelbase
- 15.20 m
- Service mass
- 69.4 t
- Adhesion mass
- 52.2 t
- Total mass
- 116.6 t
- Rigid wheelbase
- 3.66 m
- Axle load
- 17.4 t
- Water capacity
- 18,927 l
- Fuel capacity
- 7.3 t (coal)
Boiler
- Grate area
- 3.577 m²
- Firebox surface
- 13.471 m²
- Tube heating surface
- 186.735 m²
- Evaporative heating surface
- 200.206 m²
- Total heating surface
- 200.2 m²
Power plant
- Driver diameter
- 1,448 mm
- Boiler pressure
- 13.1 bar
- Expansion type
- simple expansion
- Cylinders
- two, 483 x 660 mm
Power
- Power source
- steam
- Estimated power
- 783 kW (1,065 PS)
- Starting effort
- 118.3 kN
Calculated values
- Factor of adhesion
- 1 : 4.33
- Optimal speed
- 40 km/h
- Power-to-weight ratio
- 11.3 kW/t
- Heating Surface Equivalent
- 267.6 m²
- Cylinder volume/HSE
- 1 : 902.98
- Adhesive weight/Total
- 1 : 1.33
- Tractive force/Heating surface
- 1 : 12.34
- Grate area/Heating surface
- 1 : 55.97
- Firebox/Tube surface
- 1 : 13.86
