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Southern Railway (USA) class Ms-4
The Ms-4 was a class of 115 Mikados that was used by the Southern as standard freight locomotive and as occasional replacement for passenger locomotives. It was basically an improved USRA Heavy Mikado with similar dim...
General
| Property | Southern Railway (USA) class Ms-4Remove |
|---|---|
| Built | 1923-1928 |
| Manufacturers | ALCO, Baldwin |
| Wheel arrangement | 2-8-2 (Mikado) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Southern Railway (USA) class Ms-4Remove |
|---|---|
| Wheelbase | 11.25 m |
| Rigid wheelbase | 5.11 m |
| Total wheelbase | 21.83 m |
| Service weight | 147.9 t |
| Adhesive weight | 108.6 t |
| Axle load | 27.5 t |
| Total weight | 234.7 t |
| Water capacity | 37,854 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | Southern Railway (USA) class Ms-4Remove |
|---|---|
| Grate area | 6.531 m² |
| Firebox surface | 28.521 m² |
| Tube heating surface | 369.569 m² |
| Evaporative heating surface | 398.09 m² |
| Superheater surface | 92.253 m² |
| Total heating surface | 490.3 m² |
Power plant
| Property | Southern Railway (USA) class Ms-4Remove |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 686 x 813 mm |
Power
| Property | Southern Railway (USA) class Ms-4Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,461 kW (3,346 PS) |
| Starting effort | 280.0 kN |
Calculated values
| Property | Southern Railway (USA) class Ms-4Remove |
|---|---|
| Factor of adhesion | 1 : 3.81 |
| Optimal speed | 53 km/h |
| Power-to-weight ratio | 16.6 kW/t |
| Heating Surface Equivalent | 725.2 m² |
| Cylinder volume/HSE | 1 : 828.02 |
| Adhesive weight/Total | 1 : 1.36 |
| Tractive force/Heating surface | 1 : 11.93 |
| Grate area/Heating surface | 1 : 75.08 |
| Firebox/Tube surface | 1 : 12.96 |
| Total/Superheater | 1 : 4.32 |
