Union Colliery 2-4-2 Locomotives in Canada

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 15691)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 14, p. 256. See Locobase 15690 for a discussion of James Dunsmuir's coal operations. Works number was 9782 in January 1889.

This little saddle tank was the first locomotive to be bought to support UC's extraction of coal on Victoria Island, British Columbia. Its purchase was ordered by the Pacific Improvement Company.

NB: Locobase estimates the firebox and evaporative heating surface areas by comparing the specifications of this locomotive with the very similar, if younger, saddle tank operated in the US Brooklyn Navy Yard. Other than the firebox dimensions, the other data match up exactly. Both fireboxes measured exactly the same length, width, and front wall height. The rear wall height differed by an inch. Locobase applied a correction of 1 sq ft to the direct heating surface area.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID15691
RailroadUnion Colliery
Number in Class1
Road Numbers1
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)6 / 1.83
Engine Wheelbase (ft / m)19.33 / 5.89
Ratio of driving wheelbase to overall engine wheelbase 0.31
Overall Wheelbase (engine & tender) (ft / m)19.33 / 5.89
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)36,000 / 16,329
Engine Weight (lbs / kg)48,000 / 21,772
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)48,000
Tender Water Capacity (gals / ML)500 / 1.89
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)30 / 15
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)46 / 1168
Boiler Pressure (psi / kPa)140 / 9.70
High Pressure Cylinders (dia x stroke) (in / mm)12" x 18" / 305x457
Tractive Effort (lbs / kg)6705 / 3041.34
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.37
Heating Ability
Tubes (number - dia) (in / mm)97 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 9.62 / 2.93
Firebox Area (sq ft / m2)43 / 3.99
Grate Area (sq ft / m2) 9.70 / 0.90
Evaporative Heating Surface (sq ft / m2)467 / 43.39
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)467 / 43.39
Evaporative Heating Surface/Cylinder Volume197.88
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1358
Same as above plus superheater percentage1358
Same as above but substitute firebox area for grate area6020
Power L13102
Power MT379.93

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