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Royal State Railways of Siam No. 311 and 312
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. Th...
| Royal State Railways of Siam No. 311 and 312Remove | |
|---|---|
| Variant | Standard |
| Built | 1924 |
| Manufacturers | Nasmyth, Wilson & Co. |
| Wheel arrangement | 1D1 |
| Gauge | 1000 mm |
| Length | 17882 mm |
| Service mass | 58555 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Royal State Railways of Siam No. 311 and 312 Standard Remove |
|---|---|
| Built | 1924 |
| Manufacturers | Nasmyth, Wilson & Co. |
| Wheel arrangement | 2-8-2 (Mikado) |
| Gauge | 1,000 mm |
Dimensions and weights
| Property | Royal State Railways of Siam No. 311 and 312 Standard Remove |
|---|---|
| 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
| Property | Royal State Railways of Siam No. 311 and 312 Standard Remove |
|---|---|
| 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
| Property | Royal State Railways of Siam No. 311 and 312 Standard Remove |
|---|---|
| Driver diameter | 1,105 mm |
| Boiler pressure | 11.7 bar |
| Expansion type | simple expansion |
| Cylinders | two, 464 x 594 mm |
Power
| Property | Royal State Railways of Siam No. 311 and 312 Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 820 kW (1,115 PS) |
| Starting effort | 115.0 kN |
Calculated values
| Property | Royal State Railways of Siam No. 311 and 312 Standard Remove |
|---|---|
| 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 |
