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Southern Pacific class A-6
All A-3 Atlantics built from 1904 onwards were fitted with a superheater from 1920 and most of them also received a feedwater heater and a booster on the trailing axle . Four underwent an even bigger rebuild in the So...
General
| Property | Southern Pacific class A-6Remove |
|---|---|
| Built | 1927-1928 |
| Manufacturers | Sacramento |
| Wheel arrangement | 4-4-2 (Atlantic) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Southern Pacific class A-6Remove |
|---|---|
| Wheelbase | 8.74 m |
| Rigid wheelbase | 2.13 m |
| Total wheelbase | 23.99 m |
| Service weight | 110.6 t |
| Adhesive weight | 57.5 t |
| Axle load | 29.3 t |
| Total weight | 189.6 t |
Boiler
| Property | Southern Pacific class A-6Remove |
|---|---|
| Grate area | 4.599 m² |
| Firebox surface | 16.351 m² |
| Tube heating surface | 197.791 m² |
| Evaporative heating surface | 214.142 m² |
| Superheater surface | 40.413 m² |
| Total heating surface | 254.6 m² |
Power plant
| Property | Southern Pacific class A-6Remove |
|---|---|
| Driver diameter | 2,057 mm |
| Boiler pressure | 14.5 bar |
| Expansion type | simple expansion |
| Cylinders | two, 559 x 711 mm |
Power
| Property | Southern Pacific class A-6Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,342 kW (1,825 PS) |
| Starting effort | 132.8 kN |
| Starting effort booster | 51.244 kN |
Calculated values
| Property | Southern Pacific class A-6Remove |
|---|---|
| Factor of adhesion | 1 : 4.24 |
| Optimal speed | 61 km/h |
| Power-to-weight ratio | 12.1 kW/t |
| Heating Surface Equivalent | 376.7 m² |
| Cylinder volume/HSE | 1 : 925.98 |
| Adhesive weight/Total | 1 : 1.93 |
| Tractive force/Heating surface | 1 : 10.90 |
| Grate area/Heating surface | 1 : 55.35 |
| Firebox/Tube surface | 1 : 12.10 |
| Total/Superheater | 1 : 5.30 |
