Helena Motor Railway 0-4-2 Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class Capitalist (Locobase 8154)

Data from 1944 Northern Pacific Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive Raildata collection. The steam class list on the NPRHS website -- http://research.nprha.org/Lists/Class%20List/DispForm.aspx?ID=66&Source=http%3A%2F%2Fresearch%2Enprha%2Eorg%2FLists%2FClass%2520List%2FAllItems%2Easpx -- says that this was built by the Brainerd shops in 1903. See also DeGolyer, Vol 15, p. 57. Works numbers were 9928 in April 1889 and 10231 in September.

This stubby little "shop switcher" clearly was a special-purpose machine. The diagram shows a large cab, large, possibly oil-fired headlight, and the trailing axle under the forward edge of the rear bunker. As delivered, the engines had snow plows front and back.

The trippingly named Helena Hot Spring & Smelter was a 5-mile-long street railway running on 35-50-lb (17 1/2 to 25 kg/yd) rail. As of 1890, the line had 3 "steam motors" and 6 cars.

The Capitalist was later sold to the Pe Ell Sawmill. Crystal Springs was sold to the Elliston & Southern, also in Montana, in 1897. The E&S sold it to the Edgar Wood Company in 1908, which sold it to the Northern Pacific who placed it in class H-2. The NP scrapped it in April 1936.

NB: The direct heating surface (including the firebox heating surface) is an estimate calculated by subtracting the calculated tube heating surface from the reported total evaporative heating surface.

Specifications by Steve Llanso of Sweat House Media
Locobase ID8154
RailroadHelena Motor Railway
Number in Class2
Road Numbers2-3 / 12
Number Built2
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase5'
Engine Wheelbase 9.25'
Ratio of driving wheelbase to overall engine wheebase 0.54
Overall Wheelbase (engine & tender) 9.25'
Axle Loading (Maximum Weight per Axle)17060 lbs
Weight on Drivers34000 lbs
Engine Weight40500 lbs
Tender Light Weight
Total Engine and Tender Weight40500 lbs
Tender Water Capacity500 gals
Tender Fuel Capacity (oil/coal)0.8 tons
Minimum weight of rail (calculated)28 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter40"
Boiler Pressure130 psi
Cylinders (dia x stroke)12" x 18"
Tractive Effort7160 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.75
Heating Ability
Firebox Area44 sq. ft
Grate Area 9.84 sq. ft
Evaporative Heating Surface333 sq. ft
Superheating Surface
Combined Heating Surface333 sq. ft
Evaporative Heating Surface/Cylinder Volume141.33
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1279
Same as above plus superheater percentage1279
Same as above but substitute firebox area for grate area5720
Power L12034
Power MT263.78

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