Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 54, p. 283-287. See also P C Dewhurst, "The Jamaica Government Railway and its Locomotives", Locomotive Magazine, Volume 25 (15 December 1919), pp. 212-213. Works numbers were 43559-43560 in June 1916.
Differing from the immediately preceding H-1 Mikados in the use of a four-wheel bogie ahead of the drivers, this pair of Mountains seem to have pulled the varnish trains for the JGR. Dewhurst commented that the design incorporated many of the same design ideas as the 2-8-2s, but had modified cabs and an "entirely new style of chimney [stack], with a 'Capuchon'...."
The two-swing-link, single-axle truck under the smokebox now was a bogie with three-point suspension hangars. It wasn't equalized with the drivers, but all the driving axles and the trailing truck were equalized together.
In early 1927, the Duke and Duchess of York visited Jamaica during their tour of the Empire. At the time, Prince Albert had no inkling that he would succeed Edward VIII as King of England in 1937. But his eminence dictated that the JGR would lay on a special train for the royal couple and the #40 was chosen to haul it. It temporaily bore the name "Duchess of York".
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Duchess of York/K-1 |
| Locobase ID | 12789 |
| Railroad | Jamaican Government |
| Country | Jamaica |
| Whyte | 4-8-2 |
| Number in Class | 2 |
| Road Numbers | 40-41 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Baldwin |
| Year | 1916 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12.75 / 3.89 |
| Engine Wheelbase (ft / m) | 29.25 / 8.92 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.44 |
| Overall Wheelbase (engine & tender) (ft / m) | 43.71 / 13.32 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 120,000 / 54,431 |
| Engine Weight (lbs / kg) | 160,000 / 72,575 |
| Tender Loaded Weight (lbs / kg) | 76,000 / 34,473 |
| Total Engine and Tender Weight (lbs / kg) | 236,000 / 107,048 |
| Tender Water Capacity (gals / ML) | 3600 / 13.64 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 5 / 5 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 50 / 25 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 46 / 1168 |
| Boiler Pressure (psi / kPa) | 190 / 1310 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 26" / 483x660 |
| Tractive Effort (lbs / kg) | 32,953 / 14947.25 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.64 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 173 - 2" / 51 |
| Flues (number - dia) (in / mm) | 24 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 17 / 5.18 |
| Firebox Area (sq ft / m2) | 134 / 12.45 |
| Grate Area (sq ft / m2) | 37.70 / 3.50 |
| Evaporative Heating Surface (sq ft / m2) | 2239 / 208.01 |
| Superheating Surface (sq ft / m2) | 473 / 43.94 |
| Combined Heating Surface (sq ft / m2) | 2712 / 251.95 |
| Evaporative Heating Surface/Cylinder Volume | 262.42 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 7163 |
| Same as above plus superheater percentage | 8381 |
| Same as above but substitute firebox area for grate area | 29,788 |
| Power L1 | 12,234 |
| Power MT | 899.04 |