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Southern Pacific class A-3
At the beginning of the 20th century when the Union Pacific, Southern Pacific, Kansas City Southern and others were under the same ownership, several locomotive types were standardized in the Harriman Common Standard....
General
| Property | Southern Pacific class A-3 as built |
|---|---|
| Built | 1904-1908 |
| Manufacturers | ALCO, Baldwin |
| Wheel arrangement | 4-4-2 (Atlantic) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Southern Pacific class A-3 as built |
|---|---|
| Wheelbase | 8.41 m |
| Rigid wheelbase | 2.13 m |
| Total wheelbase | 17.73 m |
| Service weight | 88.9 t |
| Adhesive weight | 47.6 t |
| Axle load | 23.8 t |
| Total weight | 153 t |
| Water capacity | 26,498 l |
| Fuel capacity | 11,129 l (oil) |
Boiler
| Property | Southern Pacific class A-3 as built |
|---|---|
| Grate area | 4.599 m² |
| Firebox surface | 16.165 m² |
| Tube heating surface | 229.935 m² |
| Evaporative heating surface | 246.1 m² |
| Total heating surface | 246.1 m² |
Power plant
| Property | Southern Pacific class A-3 as built |
|---|---|
| Driver diameter | 2,057 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 508 x 711 mm |
Power
| Property | Southern Pacific class A-3 as built |
|---|---|
| Power source | steam |
| Estimated power | 1,119 kW (1,521 PS) |
| Starting effort | 104.6 kN |
Calculated values
| Property | Southern Pacific class A-3 as built |
|---|---|
| Factor of adhesion | 1 : 4.47 |
| Optimal speed | 66 km/h |
| Power-to-weight ratio | 12.6 kW/t |
| Heating Surface Equivalent | 326.9 m² |
| Cylinder volume/HSE | 1 : 881.84 |
| Adhesive weight/Total | 1 : 1.87 |
| Tractive force/Heating surface | 1 : 8.87 |
| Grate area/Heating surface | 1 : 53.51 |
| Firebox/Tube surface | 1 : 14.22 |
