Railway Auto Car Company 2-2-4 Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class unknown (Locobase 14062)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 45, p. 142. (Thanks to Chris Hohl for his 14 March 2018 email reporting the valve gear.) Works number was 33417 in May 1909.

See Locobase 13135 for a full description of a slightly earlier auto car. The Baldwin specs give details about the expectation for this coal-burner.

The RA Company was the American agency for the Hungarian Ganz company, which supplied "Auto cars" in Europe. "Mr Romer" of the RAC furnished the plans from which Baldwin was to "furnish mechanical parts for 200 HP type railway auto car comprising the boiler, superheater and all controlling parts and connections." The superheater consisted of tubes (119 sq ft/11.06 sq m) and a drum (11 sq ft/1.02 sq m). The front truck held a front, unpowered axle and the driven rear axle. Timothy Hackworth's son John Wesley Hackworth invented the radial gear in 1859.

Its fuel consumption of either anthracite or bituminous coal was not to exceed 30 pounds per mile (8.45 kg/km). Speeds of up to 50 mph (81 km/h) on the level were called for unless the auto car was pulling a 60,000-lb (27,216-kg) trailer in which case top speed dropped to 40 mph (64 km/h). Without the trailer, the autocar was to scale a 2 1/2% grade at 15 mph (24 km/h).

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID14,062
RailroadRailway Auto Car Company
Number in Class1
Road Numbers
Number Built1
BuilderBurnham, Williams & Co
Valve GearHackworth
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)40.58 / 12.37
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender) (ft / m)40.58 / 12.37
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)60,000 / 27,216
Engine Weight (lbs / kg)100,000 / 45,359
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)1000 / 3.79
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)100 / 50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)36 / 914
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)12" x 12" / 305x305
Tractive Effort (lbs / kg)6528 / 2961.05
Factor of Adhesion (Weight on Drivers/Tractive Effort) 9.19
Heating Ability
Firebox Area (sq ft / m2)60.60 / 5.63
Grate Area (sq ft / m2)14 / 1.30
Evaporative Heating Surface (sq ft / m2)697 / 64.75
Superheating Surface (sq ft / m2)130 / 12.08
Combined Heating Surface (sq ft / m2)827 / 76.83
Evaporative Heating Surface/Cylinder Volume443.72
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2240
Same as above plus superheater percentage2598
Same as above but substitute firebox area for grate area11,247
Power L113,262
Power MT487.29

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