Cumberland Valley No. 13 “Pioneer”
In 1851, the Cumberland Valley had a tank locomotive built by Seth Wilmarth, which was intended for passenger trains with a small number of passengers. The basic idea was to keep the ratio of the empty weight of the locomotive to the weight of the train as advantageous as possible in order to save costs. It had the wheel arrangement 2-2-2, which was generally very rare in tank locomotives and was hardly found in the USA, even with tender locomotives. In addition to the “Pioneer” there was also the almost identical “Jenny Lind” and two other very similar locomotives.
The “Pioneer” could accelerate a train of four passenger cars to 40 mph and achieved a high mileage for several years for its standards. After the Civil War, it was used to haul work trains because its power was no longer sufficient for modern passenger trains. Although it was later put into storage, it officially remained in service until 1901. It was then donated to the Smithsonian Institution and used as a working display at appropriate events.
Technical data
General
- Built
- 1851
- Manufacturers
- Seth Wilmarth
- Wheel arrangement
- 2-2-2T (Jenny Lind)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Wheelbase
- 4.14 m
- Service mass
- 11.3 t
- Rigid wheelbase
- 4.14 m
- Water capacity
- 2,271 l
Boiler
- Grate area
- 0.488 m²
- Firebox surface
- 3.814 m²
- Tube heating surface
- 20.341 m²
- Evaporative heating surface
- 24.155 m²
- Total heating surface
- 24.2 m²
Power plant
- Driver diameter
- 1,372 mm
- Boiler pressure
- 6.9 bar
- Expansion type
- simple expansion
- Cylinders
- two, 216 x 356 mm
Power
- Power source
- steam
- Estimated power
- 30 kW (41 PS)
- Starting effort
- 7.1 kN
Calculated values
- Optimal speed
- 26 km/h
- Power-to-weight ratio
- 2.6 kW/t
- Heating Surface Equivalent
- 43.2 m²
- Cylinder volume/HSE
- 1 : 602.35
- Tractive force/Heating surface
- 1 : 6.12
- Grate area/Heating surface
- 1 : 49.50
- Firebox/Tube surface
- 1 : 5.33