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Southern Pacific classes AC-7, AC-8 and AC-10 to AC-12
After the AC-6 class cab forwards, 26 slightly larger AC-7 class locomotives were built in 1937. They were technically almost identical to their predecessors and differed visually in that they had a larger tender and ...
| Southern Pacific classes AC-7, AC-8 and AC-10 to AC-12Remove | |
|---|---|
| Variant | AC-10 to AC-12 |
| Built | 1942-1944 |
| Manufacturers | Baldwin |
| Wheel arrangement | 2D(D1) ma |
| Gauge | 1435 mm |
| Length | |
| Service mass | 298419 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Southern Pacific classes AC-7, AC-8 and AC-10 to AC-12AC-10 to AC-12 |
|---|---|
| Built | 1942-1944 |
| Manufacturers | Baldwin |
| Wheel arrangement | 4-8-8-2 |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Southern Pacific classes AC-7, AC-8 and AC-10 to AC-12AC-10 to AC-12 |
|---|---|
| Wheelbase | 20.50 m |
| Total wheelbase | 34.19 m |
| Service mass | 298.4 t |
| Adhesion mass | 241.2 t |
| Total mass | 443.6 t |
| Rigid wheelbase | 5.13 m |
| Axle load | 31.3 t |
| Water capacity | 83,279 l |
| Fuel capacity | 23,091 l (oil) |
Boiler
| Property | Southern Pacific classes AC-7, AC-8 and AC-10 to AC-12AC-10 to AC-12 |
|---|---|
| Grate area | 12.914 m² |
| Firebox surface | 44.408 m² |
| Tube heating surface | 556.676 m² |
| Evaporative heating surface | 601.084 m² |
| Superheater surface | 242.942 m² |
| Total heating surface | 844.0 m² |
Power plant
| Property | Southern Pacific classes AC-7, AC-8 and AC-10 to AC-12AC-10 to AC-12 |
|---|---|
| Driver diameter | 1,613 mm |
| Boiler pressure | 17.2 bar |
| Expansion type | simple expansion |
| Cylinders | four, 610 x 813 mm |
Power
| Property | Southern Pacific classes AC-7, AC-8 and AC-10 to AC-12AC-10 to AC-12 |
|---|---|
| Power source | steam |
| Indicated power | 4,474 kW (6,083 PS) |
| Starting effort | 548.8 kN |
Calculated values
| Property | Southern Pacific classes AC-7, AC-8 and AC-10 to AC-12AC-10 to AC-12 |
|---|---|
| Factor of adhesion | 1 : 4.31 |
| Optimal speed | 50 km/h |
| Power-to-weight ratio | 15.0 kW/t |
| Heating Surface Equivalent | 1,309.0 m² |
| Cylinder volume/HSE | 1 : 724.91 |
| Adhesive weight/Total | 1 : 1.24 |
| Tractive force/Heating surface | 1 : 13.58 |
| Grate area/Heating surface | 1 : 65.36 |
| Firebox/Tube surface | 1 : 12.54 |
| Total/Superheater | 1 : 2.47 |
