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South Indian class M
India | 1913 | 5 produced
Locomotive Magazine, July 1913

Chief engineer Robert White had five ten-wheelers built for mail traffic on the meter-gauge routes, including in the direction of Sri Lanka. These used the BESA standard design and came from Hawthorn, Leslie & Co. at Newcastle. Thus they had 16.5 inch diameter outside cylinders, 57 inch diameter coupled wheels and Belpaire firebox with a long narrow grate

However, only one engine was built according to the design using saturated steam, the others being the first narrow-gauge superheated locomotives in India. With the results of the five locomotives, White was able to substantiate his assumption that superheated steam should have a clear advantage despite the greater complexity. Thus, the only saturated engine was soon retrofitted with a superheater

General
Built1913
ManufacturerHawthorn, Leslie & Co.
Axle config4-6-0 (Ten-wheeler) 
Gauge3 ft 3 3/8 in (Meter gauge)
Dimensions and Weights
Wheelbase21 ft 1 1/2 in
Fixed wheelbase12 ft
Total wheelbase42 ft 2 in
Service weight79,083 lbs
Adhesive weight60,424 lbs
Total weight134,299 lbs
Axle load20,160 lbs
Water capacity2,402 us gal
Fuel capacity12,320 lbs (coal)
Power
Power sourcesteam
Estimated power700 hp (522 kW)
Optimal speed29 mph
Starting effort15,184 lbf
Power Plant
Driver diameter57 in
Boiler pressure170 psi
Expansion typesimple
Cylinderstwo, 16 1/2 x 22 in
Boiler
Grate area16 sq ft
Firebox area108 sq ft
Tube heating area710.6 sq ft
Evaporative heating area818.6 sq ft
Superheater area194.6 sq ft
Total heating area1,013.2 sq ft
Calculated Values
steam locomotive
passenger
freight
Robert White
last changed: 10/2022
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