Queensland Government Rlys 2-8-0 Locomotives in Australia

Class Details by Steve Llanso of Sweat House Media

Class 8D15 tender - reboilered (Locobase 13763)

Data from the Queensland Railways Interest Group's website at [], last accessed 21 January 2012.

As noted in Locobase 13761, two of the original five 8D15 Mikado tanks were converted in 1890 to 2-8-0s with tenders. This pair received the same new boiler in 1903 as was installed on the 3 tank engines. The grate was slightly larger, the boiler somewhat smaller, but weight changed little, increasing by only 6 cwt (672 lb). The table in QRIG indicates that the boiler pressure remained set at 130 psi, but Locobase doubts this as he also is skeptical that the tender capacity would have been reduced by 400 Imperial gallons during the upgrade.

Both tender engines were quite satisfactory and remained in service until 1938.

Principal Dimensions by Steve Llanso of Middle Run Media

Class8D15 tender - reboilered
Locobase ID13763
RailroadQueensland Government Rlys
Number in Class2
Road Numbers134, 133
Number Built
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)55,776 / 25,300
Engine Weight (lbs / kg)64,288 / 29,161
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)1680 / 6.36
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 4.40 / 4
Minimum weight of rail (calculated) (lb/yd / kg/m)23 / 11.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)36 / 914
Boiler Pressure (psi / kPa)150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)15" x 20" / 381x508
Tractive Effort (lbs / kg)15,938 / 7229.36
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.50
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)72 / 6.69
Grate Area (sq ft / m2)14 / 1.30
Evaporative Heating Surface (sq ft / m2)662 / 61.50
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)662 / 61.50
Evaporative Heating Surface/Cylinder Volume161.83
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2100
Same as above plus superheater percentage2100
Same as above but substitute firebox area for grate area10,800
Power L12249
Power MT355.58

All material Copyright © SteamLocomotive.com
Wes Barris