Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 32, p. 41 . Works numbers were 33174-33175 in January 1909.
Requirements for this pair of side tanks included a guarantee "...to haul 625-650 [long] tons ...up a grade of 1 foot in 125 feet [little more than 0.4%]." Their dimensions matched exactly those of a set of California Northwestern logging tanks from 1903 (Locobase 8173).
Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 36, p. 338 . Works numbers were 34815-34818 in June 1910 and 52337-52357 in September 1919.
Described as "suburbans" in contemporary reports, these small tanks were well-suited demands for acceleration and bi-directional operation. They seem to have performed satisfactorily because the railway ordered three more nine years later.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | 31 | 51 |
| Locobase ID | 12964 | 12963 |
| Railroad | Peking-Kalgan | Peking-Kalgan |
| Country | China | China |
| Whyte | 2-6-2T | 2-6-2ST |
| Number in Class | 2 | 7 |
| Road Numbers | 31-32 | 51-57 |
| Gauge | Std | Std |
| Number Built | 2 | 7 |
| Builder | Baldwin | Baldwin |
| Year | 1909 | 1910 |
| Valve Gear | Stephenson | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 8.40 / 2.56 | 10 / 3.05 |
| Engine Wheelbase (ft / m) | 22.50 / 6.86 | 25.75 / 7.85 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.37 | 0.39 |
| Overall Wheelbase (engine & tender) (ft / m) | 22.50 / 6.86 | 25.75 / 7.85 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
| Weight on Drivers (lbs / kg) | 83,520 / 37,884 | 87,000 / 39,463 |
| Engine Weight (lbs / kg) | 116,420 / 52,807 | 111,000 / 50,349 |
| Tender Loaded Weight (lbs / kg) | ||
| Total Engine and Tender Weight (lbs / kg) | ||
| Tender Water Capacity (gals / ML) | 1500 / 5.68 | 1600 / 6.06 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.40 / 3 | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 46 / 23 | 48 / 24 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 46 / 1168 | 44 / 1118 |
| Boiler Pressure (psi / kPa) | 180 / 1240 | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 22" / 432x559 | 16" x 24" / 406x610 |
| Tractive Effort (lbs / kg) | 21,147 / 9592.13 | 21,364 / 9690.56 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.95 | 4.07 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 190 - 2" / 51 | 152 - 2" / 51 |
| Flues (number - dia) (in / mm) | ||
| Flue/Tube length (ft / m) | 10.21 / 3.11 | 13.54 / 4.13 |
| Firebox Area (sq ft / m2) | 91.60 / 8.51 | 90 / 8.36 |
| Grate Area (sq ft / m2) | 14.40 / 1.34 | 14.40 / 1.34 |
| Evaporative Heating Surface (sq ft / m2) | 1099 / 102.14 | 1161 / 107.90 |
| Superheating Surface (sq ft / m2) | ||
| Combined Heating Surface (sq ft / m2) | 1099 / 102.14 | 1161 / 107.90 |
| Evaporative Heating Surface/Cylinder Volume | 190.15 | 207.88 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 2592 | 2592 |
| Same as above plus superheater percentage | 2592 | 2592 |
| Same as above but substitute firebox area for grate area | 16,488 | 16,200 |
| Power L1 | 3718 | 3808 |
| Power MT | 294.42 | 289.49 |