Compare locomotives
Add a locomotive
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...
| Southern Pacific class M-4Remove | |
|---|---|
| Variant | superheated |
| Built | 1920-1922 |
| Manufacturers | Sacramento |
| Wheel arrangement | 1C |
| Gauge | 1435 mm |
| Length | |
| Service mass | 71622 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Southern Pacific class M-4superheated |
|---|---|
| Built | 1920-1922 |
| Manufacturers | Sacramento |
| Wheel arrangement | 2-6-0 (Mogul) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Southern Pacific class M-4superheated |
|---|---|
| Wheelbase | 7.09 m |
| Total wheelbase | 14.24 m |
| Service mass | 71.6 t |
| Adhesion mass | 61.1 t |
| Rigid wheelbase | 4.62 m |
| Axle load | 20.4 t |
| Water capacity | 17,034 l |
| Fuel capacity | 9.1 t (coal) |
Boiler
| Property | Southern Pacific class M-4superheated |
|---|---|
| Grate area | 2.81 m² |
| Firebox surface | 14.493 m² |
| Tube heating surface | 125.419 m² |
| Evaporative heating surface | 139.912 m² |
| Superheater surface | 24.991 m² |
| Total heating surface | 164.9 m² |
Power plant
| Property | Southern Pacific class M-4superheated |
|---|---|
| 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-4superheated |
|---|---|
| Power source | steam |
| Estimated power | 820 kW (1,115 PS) |
| Starting effort | 127.7 kN |
Calculated values
| Property | Southern Pacific class M-4superheated |
|---|---|
| Factor of adhesion | 1 : 4.69 |
| Optimal speed | 39 km/h |
| Power-to-weight ratio | 11.4 kW/t |
| Heating Surface Equivalent | 262.4 m² |
| Cylinder volume/HSE | 1 : 1,098.86 |
| Adhesive weight/Total | 1 : 1.17 |
| Tractive force/Heating surface | 1 : 16.18 |
| Grate area/Heating surface | 1 : 58.68 |
| Firebox/Tube surface | 1 : 8.65 |
| Total/Superheater | 1 : 5.60 |
