Cairns Mulgrave Tramway 4-6-0 Locomotives in Australia

Class Details by Steve Llanso of Sweat House Media

Class 5 (Locobase 13266)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 31, p.187. See also Dave Elsmore, "Queensland. Cairns Mulgrave Tramway" archived at [], last accessed 15 October 2011. Works number was 32678 in February 1908.

Elsmore tells us that this railway was an example of a common carrier that was built by the district board (a predecessor to the shire council) instead of the state authorities. Lightly (Elsmore says "cheaply") built, the 31-mile line had "low-level bridges and a minimum of earthworks."It was a demand-stop line "...only stopping on signal to taken on passengers or parcels, with the passengers wishing to alight giving notice to the guard at the previous station."

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID13266
RailroadCairns Mulgrave Tramway
Number in Class1
Road Numbers5
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.50 / 2.90
Engine Wheelbase (ft / m)17.67 / 5.39
Ratio of driving wheelbase to overall engine wheelbase 0.54
Overall Wheelbase (engine & tender) (ft / m)17.67 / 5.39
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)80,000 / 36,287
Engine Weight (lbs / kg)90,000 / 40,823
Tender Loaded Weight (lbs / kg)33,600 / 15,241
Total Engine and Tender Weight (lbs / kg)123,600 / 56,064
Tender Water Capacity (gals / ML)1680 / 6.36
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 4.50 / 4
Minimum weight of rail (calculated) (lb/yd / kg/m)44 / 22
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)40 / 1016
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)13" x 20" / 330x508
Tractive Effort (lbs / kg)11,492 / 5212.69
Factor of Adhesion (Weight on Drivers/Tractive Effort) 6.96
Heating Ability
Tubes (number - dia) (in / mm)176 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.52 / 3.21
Firebox Area (sq ft / m2)99 / 9.20
Grate Area (sq ft / m2)15.80 / 1.47
Evaporative Heating Surface (sq ft / m2)1061 / 98.57
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1061 / 98.57
Evaporative Heating Surface/Cylinder Volume345.32
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2528
Same as above plus superheater percentage2528
Same as above but substitute firebox area for grate area15,840
Power L15402
Power MT446.60

All material Copyright ©
Wes Barris