South Manchurian 2-2-4 Locomotives in Japan

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 13135)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 30, p. 229. See also "Locomotives for South Manchurian Railroads," The Railroad Gazette, Volume XLII, No. 23 (6 December 1907), pp. 690-691. (Thanks to Alexander Blessing for his 7 May 2023 email noting the engine and overall databases, axle loading, Works numbers were 30825-30826 in May 1907. The weight on the engine unit (the single driving axle and its trailing axle) totalled 48,600 lb (20,045 kg).

Baldwin's arrangement code for these inspection engines was 8-12 1/4 B (see Locobase 14062 for another "auto car").

Viewed from the outside, the vehicle looked like a conventional passenger car with open platforms and chairs as well as a cowcatcher-style pilot on each end. The rear half rode on a swing-bolster, 4-wheeled truck and was well-appointed with eight comfy chairs. The front half showed the single set of drivers and a leading carrying axle in a Rushton truck.

Through the windows of the front half of the car body, which was built by the Pennsylvania Railroad, an observer would see the long locomotive-style boiler. The boiler's firebox was positioned ahead of the boiler and over the two cylinders. As the RA report notes, this location required the exhaust steam to be led along the boiler to emerge in a stack in the middle of the car's roof.

The coal bunker was 17" wide, 8 feet long, and 2 feet high. The water tank hung from the roof in the center of the car and held 875 gallons; it was filled through a funnel in the roof.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID13135
RailroadSouth Manchurian
Number in Class2
Road Numbers1-2
Number Built2
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m) 6.17 / 1.88
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)28.25 / 8.61
Axle Loading (Maximum Weight per Axle) (lbs / kg)25,399 / 11,521
Weight on Drivers (lbs / kg)25,399 / 11,521
Engine Weight (lbs / kg)72,600 / 32,931
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)874 / 3.31
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 0.60 / 0.50
Minimum weight of rail (calculated) (lb/yd / kg/m)42 / 21
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)54 / 1372
Boiler Pressure (psi / kPa)159.50 / 11
High Pressure Cylinders (dia x stroke) (in / mm)9.02" x 15.98" / 229x406
Tractive Effort (lbs / kg)3264 / 1480.53
Factor of Adhesion (Weight on Drivers/Tractive Effort) 7.78
Heating Ability
Tubes (number - dia) (in / mm)144 - 1.496" / 38
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 5.54 / 1.69
Firebox Area (sq ft / m2)51.56 / 4.79
Grate Area (sq ft / m2) 9.58 / 0.89
Evaporative Heating Surface (sq ft / m2)360 / 33.45
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)360 / 33.45
Evaporative Heating Surface/Cylinder Volume304.60
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1528
Same as above plus superheater percentage1528
Same as above but substitute firebox area for grate area8224
Power L17504
Power MT651.34

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Wes Barris