Data from "Manila Railway D class" in Wikipedia at [] and "Manila Railroad 45 class" at [], both last accessed 28 September 2025. Works numbers were 965-972 in 1907.
A year after the widely hailed 4-4-2 Class 100s entered service on the Baguio Special, the MR's general manager Horace L Higgins secured this octet of virtually identical Ten-wheelers. In fact, the only significant difference consisted of replacing the carrier with the third driven axle.
Wikipedia's entry on the 37s reports that very little information is available concerning their use. The 45 entry (Locobase ) contends the 37s were indeed part of the Baguio Special's locomotive stud and that they were "also used on inaugural Bicol Express services on the South Main Line to Lucena, Quezon, by c. 1916."
Like the 100s, these relatively high-drivered engines wound up hauling sugar-cane trains beginning in the 1920s.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 37 |
| Locobase ID | 21260 |
| Railroad | Manila Railroad |
| Country | Philippines |
| Whyte | 4-6-0 |
| Number in Class | 8 |
| Road Numbers | 37-44 |
| Gauge | 3'6" |
| Number Built | 8 |
| Builder | Kerr, Stuart & Co |
| Year | 1907 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12 / 3.66 |
| Engine Wheelbase (ft / m) | 21.17 / 6.45 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.57 |
| Overall Wheelbase (engine & tender) (ft / m) | 43.54 / 13.27 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 70,560 / 32,006 |
| Engine Weight (lbs / kg) | 95,200 / 43,182 |
| Tender Loaded Weight (lbs / kg) | 85,000 / 38,555 |
| Total Engine and Tender Weight (lbs / kg) | 180,200 / 81,737 |
| Tender Water Capacity (gals / ML) | 3000 / 11.36 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 39 / 19.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 60 / 1524 |
| Boiler Pressure (psi / kPa) | 180 / 1230 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 24" / 406x610 |
| Tractive Effort (lbs / kg) | 15,667 / 7106.44 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.50 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 107 / 9.94 |
| Grate Area (sq ft / m2) | 16.50 / 1.53 |
| Evaporative Heating Surface (sq ft / m2) | 1080 / 100.34 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1080 / 100.34 |
| Evaporative Heating Surface/Cylinder Volume | 193.37 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2970 |
| Same as above plus superheater percentage | 2970 |
| Same as above but substitute firebox area for grate area | 19,260 |
| Power L1 | 5205 |
| Power MT | 487.88 |