Jamaican Government 4-8-2 Locomotives in Jamaica

Class Details by Steve Llanso of Sweat House Media

Class Duchess of York/K-1 (Locobase 12789)

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 Sweat House Media

ClassDuchess of York/K-1
Locobase ID12789
RailroadJamaican Government
Number in Class2
Road Numbers40-41
Number Built2
Valve GearWalschaert
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 / 13.10
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 Volume262.42
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7163
Same as above plus superheater percentage8381
Same as above but substitute firebox area for grate area29,788
Power L112,234
Power MT899.04

All material Copyright © SteamLocomotive.com
Wes Barris