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Madras & Southern Mahratta class 477
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India | 1910
25 produced
Image of locomotive
Locomotive Magazine, February 1913

These Madras & Southern Mahratta locomotives were basically based on the design of the Indian Standards Committee, but as an innovation they were operated with superheated steam and had a slightly reduced boiler pressure. The superheater was of the Schmidt design and had a proportionately larger heating surface than most British-built locomotives. After the four Stephenson locomotives from 1910, a total of 21 from Kitson and Armstrong-Whitworth came in 1919 with slightly altered boiler dimensions and a smaller superheater. Other, almost identical ones went to the Bombay, Baroda & Central India.

Variant477481
General
Built19101919
ManufacturerRobert Stephenson & Co.Kitson & Co., Armstrong Whitworth
Axle config2-8-0 (Consolidation) 
Gauge5 ft 6 in (Indian broad gauge)
Dimensions and Weights
Wheelbase25 ft
Rigid wheelbase16 ft
Total wheelbase50 ft 8 3/4 in
Service weight164,416 lbs163,856 lbs
Adhesive weight144,032 lbs143,920 lbs
Total weight307,396 lbs306,836 lbs
Axle load36,008 lbs
Water capacity4,804 us gal
Fuel capacity16,800 lbs (coal)
Boiler
Grate area32 sq ft
Firebox area167 sq ft168 sq ft
Tube heating area1,454 sq ft1,411 sq ft
Evaporative heating area1,621 sq ft1,579 sq ft
Superheater area375.2 sq ft260 sq ft
Total heating area1,996.2 sq ft1,839 sq ft
Variant477481
Power Plant
Driver diameter56.5 in
Boiler pressure160 psi
Expansion typesimple
Cylinderstwo, 22 x 26 in
Power
Power sourcesteam
Estimated power1,100 hp (820 kW)1,075 hp (802 kW)
Starting effort30,291 lbf
Calculated Values
Optimal speed23 mph
steam locomotive
freight
last changed: 04/2023
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