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Southern Pacific class M-4
A total of 105 of these Moguls were put into service by the Southern Pacific beginning in 1899. They were from ALCO, most of them from Cooke and the rest from Schenectady. Starting in 1920, they were rebuilt with a su...
General
| Property | Southern Pacific class M-4 as built |
|---|---|
| Built | 1899-1901 |
| Manufacturers | Cooke, Schenectady |
| Wheel arrangement | 2-6-0 (Mogul) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Southern Pacific class M-4 as built |
|---|---|
| Wheelbase | 7.09 m |
| Rigid wheelbase | 4.62 m |
| Total wheelbase | 14.24 m |
| Service weight | 64.7 t |
| Adhesive weight | 56.1 t |
| Axle load | 18.7 t |
| Water capacity | 17,034 l |
| Fuel capacity | 9.1 t (coal) |
Boiler
| Property | Southern Pacific class M-4 as built |
|---|---|
| Grate area | 2.81 m² |
| Firebox surface | 15.608 m² |
| Tube heating surface | 180.882 m² |
| Evaporative heating surface | 196.49 m² |
| Total heating surface | 196.5 m² |
Power plant
| Property | Southern Pacific class M-4 as built |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 13.1 bar |
| Expansion type | simple expansion |
| Cylinders | two, 508 x 711 mm |
Power
| Property | Southern Pacific class M-4 as built |
|---|---|
| Power source | steam |
| Estimated power | 634 kW (862 PS) |
| Starting effort | 127.7 kN |
Calculated values
| Property | Southern Pacific class M-4 as built |
|---|---|
| Factor of adhesion | 1 : 4.31 |
| Optimal speed | 31 km/h |
| Power-to-weight ratio | 9.8 kW/t |
| Heating Surface Equivalent | 274.5 m² |
| Cylinder volume/HSE | 1 : 1,050.14 |
| Adhesive weight/Total | 1 : 1.15 |
| Tractive force/Heating surface | 1 : 13.57 |
| Grate area/Heating surface | 1 : 69.93 |
| Firebox/Tube surface | 1 : 11.59 |
