Southern Mahratta 4-6-0 Locomotives in India

Class Details by Steve Llanso of Sweat House Media

Class 145 (Locobase 10612)

Data from "New Passenger Locomotives, SMR ", The Locomotive Magazine, Vol XIII (15 March 1907), p. 45. Boiler pressure is an estimate.

This set of Ten-wheelers had Belpaire fireboxes, radial valve gear outside, a capped stack, dome over the leading coupled axle, inside bearings on the bogie, and a long cab roof. Their main service ran from Poona to the South of India through Bangalore.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID10612
RailroadSouthern Mahratta
Number in Class
Road Numbers
Number Built
Valve GearWalschaert
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)
Engine Weight (lbs / kg)71,232 / 32,310
Tender Loaded Weight (lbs / kg)46,704 / 21,185
Total Engine and Tender Weight (lbs / kg)117,936 / 53,495
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)57 / 1448
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)15" x 22" / 381x559
Tractive Effort (lbs / kg)11,811 / 5357.39
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)95.50 / 8.88
Grate Area (sq ft / m2)15 / 1.39
Evaporative Heating Surface (sq ft / m2)918 / 85.32
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)918 / 85.32
Evaporative Heating Surface/Cylinder Volume204.01
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2400
Same as above plus superheater percentage2400
Same as above but substitute firebox area for grate area15,280
Power L14714
Power MT

All material Copyright ©
Wes Barris