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Royal State Railways of Siam No. 311 and 312
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Thailand | 1924
2 produced
Image of locomotive
flickr/Historical Railway Images

In the twenties, the Royal State Railways of Siam (Thailand) got Mikado locomotives from different manufacturers. Beside some from the USA and France, two were delivered in 1924 by Nasmyth, Wilson & Co. in Britain. These were numbered 311 and 312 and used wood as fuel. According to contemporary reports, they performed very well. So far there is only a short text for this vehicle. In the future it will be described in more detail.

General
Built1924
ManufacturerNasmyth, Wilson & Co.
Axle config2-8-2 (Mikado) 
Gauge3 ft 3 3/8 in (Meter gauge)
Dimensions and Weights
Length58 ft 8 in
Wheelbase27 ft 2 5/8 in
Rigid wheelbase12 ft 9 3/8 in
Total wheelbase48 ft 2 5/8 in
Service weight129,091 lbs
Adhesive weight88,659 lbs
Total weight209,059 lbs
Axle load22,221 lbs
Water capacity3,603 us gal
Fuel capacity18,300 lbs (wood)
Boiler
Grate area32.7 sq ft
Firebox area145 sq ft
Tube heating area1,130 sq ft
Evaporative heating area1,275 sq ft
Superheater area280 sq ft
Total heating area1,555 sq ft
Power Plant
Driver diameter43.5 in
Boiler pressure170 psi
Expansion typesimple
Cylinderstwo, 18 1/4 x 23 3/8 in
Power
Power sourcesteam
Estimated power1,100 hp (820 kW)
Optimal speed27 mph
Starting effort25,862 lbf
Calculated Values
steam locomotive
freight
last changed: 11/2024
Schematical drawing with dimensions
Schematical drawing with dimensions
flickr/Historical Railway Images
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