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The reference for locomotives and railcars

Cumberland Valley No. 13 “Pioneer”

United States 1851 4 produced
“Pioneer” at the 1948 Chicago Railroad Fair Dudley W. Thickens / Taylor Rush collection

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.

Schematic drawing Railway and Locomotive Engineering, October 1903

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
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