Madras & Southern Mahratta 4-4-0 Locomotives in India


Class Details by Steve Llanso of Sweat House Media

Class 204 (Locobase 16042)

Data from "4-4-0 Tank Locomotives, Madras & Southern Mahratta Railway", Locomotive Magazine, Vol XVI (15 June 1910), p. 128.

Bagnall turned out this pair of Eight-wheeler tanks following the specifications of Messrs/ Rendel & Robertson, the railway's consulting engineers. The LM report says that they were expressly built for fast branch-line services in which speeds could reach 35 mph (56.4 km/h). As befitted a British-built locomotive for the colonies, the firebox was copper and the tubes were brass.

Principal Dimensions by Steve Llanso of Sweat House Media

Class204
Locobase ID16042
RailroadMadras & Southern Mahratta
CountryIndia
Whyte4-4-0T
Number in Class2
Road Numbers
GaugeMetre
Number Built2
BuilderWG Bagnall
Year1910
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 5.50 / 1.68
Engine Wheelbase (ft / m)14.75 / 4.50
Ratio of driving wheelbase to overall engine wheelbase 0.37
Overall Wheelbase (engine & tender) (ft / m)14.75 / 4.50
Axle Loading (Maximum Weight per Axle) (lbs / kg)19,040 / 8636
Weight on Drivers (lbs / kg)39,360 / 17,853
Engine Weight (lbs / kg)57,680 / 26,163
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)57,680 / 26,163
Tender Water Capacity (gals / ML)720 / 2.73
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.70 / 2
Minimum weight of rail (calculated) (lb/yd / kg/m)33 / 16.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42.50 / 1080
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)11" x 18" / 279x457
Tractive Effort (lbs / kg)7841 / 3556.62
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.02
Heating Ability
Tubes (number - dia) (in / mm)129 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 6.58 / 2.01
Firebox Area (sq ft / m2)50 / 4.65
Grate Area (sq ft / m2) 7.50 / 0.70
Evaporative Heating Surface (sq ft / m2)440 / 40.88
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)440 / 40.88
Evaporative Heating Surface/Cylinder Volume222.24
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1350
Same as above plus superheater percentage1350
Same as above but substitute firebox area for grate area9000
Power L14444
Power MT497.83

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