Compare locomotives
Add a locomotive
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...
General
| Property | Royal State Railways of Siam No. 311 and 312Remove |
|---|---|
| Built | 1924 |
| Manufacturers | Nasmyth, Wilson & Co. |
| Wheel arrangement | 2-8-2 (Mikado) |
| Gauge | 1,000 mm (Meter gauge) |
Dimensions and weights
| Property | Royal State Railways of Siam No. 311 and 312Remove |
|---|---|
| Length | 17.88 m |
| Wheelbase | 8.30 m |
| Rigid wheelbase | 3.90 m |
| Total wheelbase | 14.70 m |
| Service weight | 58.6 t |
| Adhesive weight | 40.2 t |
| Axle load | 10.1 t |
| Total weight | 94.8 t |
| Water capacity | 13,639 l |
| Fuel capacity | 8.3 t (wood) |
Boiler
| Property | Royal State Railways of Siam No. 311 and 312Remove |
|---|---|
| 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 312Remove |
|---|---|
| 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 312Remove |
|---|---|
| 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 312Remove |
|---|---|
| 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 |
