Royal State Railways of Siam No. 311 and 312
Thailand 1924 2 produced
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.
Technical data
General
- Built
- 1924
- Manufacturers
- Nasmyth, Wilson & Co.
- Wheel arrangement
- 2-8-2 (Mikado)
- Gauge
- 1,000 mm (Meter gauge)
Dimensions and weights
- Length
- 17.88 m
- Wheelbase
- 8.30 m
- Total wheelbase
- 14.70 m
- Service mass
- 58.6 t
- Adhesion mass
- 40.2 t
- Total mass
- 94.8 t
- Rigid wheelbase
- 3.90 m
- Axle load
- 10.1 t
- Water capacity
- 13,639 l
- Fuel capacity
- 8.3 t (wood)
Boiler
- Grate area
- 3.038 m²
- Firebox surface
- 13.471 m²
- Tube heating surface
- 104.981 m²
- Evaporative heating surface
- 118.451 m²
- Superheater surface
- 26.013 m²
- Total heating surface
- 144.5 m²
Power plant
- Driver diameter
- 1,105 mm
- Boiler pressure
- 11.7 bar
- Expansion type
- simple expansion
- Cylinders
- two, 464 x 594 mm
Power
- Power source
- steam
- Estimated power
- 820 kW (1,115 PS)
- Starting effort
- 115.0 kN
Calculated values
- Factor of adhesion
- 1 : 3.43
- Optimal speed
- 43 km/h
- Power-to-weight ratio
- 14.0 kW/t
- Heating Surface Equivalent
- 237.8 m²
- Cylinder volume/HSE
- 1 : 842.61
- Adhesive weight/Total
- 1 : 1.46
- Tractive force/Heating surface
- 1 : 16.63
- Grate area/Heating surface
- 1 : 47.55
- Firebox/Tube surface
- 1 : 7.79
- Total/Superheater
- 1 : 4.55
