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 | |
|---|---|
| Class | 1 |
| Locobase ID | 13135 |
| Railroad | South Manchurian |
| Country | Japan |
| Whyte | 2-2-4T |
| Number in Class | 2 |
| Road Numbers | 1-2 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Burnham, Williams & Co |
| Year | 1907 |
| Valve Gear | Stephenson |
| 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 / 1100 |
| 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 Volume | 304.60 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1528 |
| Same as above plus superheater percentage | 1528 |
| Same as above but substitute firebox area for grate area | 8224 |
| Power L1 | 7504 |
| Power MT | 651.34 |