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Southern Pacific class AC-9
While most of Southern Pacific's later articulated locomotives were Cab Forwards, the twelve AC-9s were of conventional design. Since there were no tunnels to pass through on the line from Tucumcari, New Mexico to El ...
| Southern Pacific class AC-9Remove | |
|---|---|
| Variant | Standard |
| Built | 1939 |
| Manufacturers | Lima |
| Wheel arrangement | (1D)D2 ma |
| Gauge | 1435 mm |
| Length | |
| Service mass | 312934 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Southern Pacific class AC-9 Standard Remove |
|---|---|
| Built | 1939 |
| Manufacturers | Lima |
| Wheel arrangement | 2-8-8-4 (Yellowstone) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Southern Pacific class AC-9 Standard Remove |
|---|---|
| Wheelbase | 20.19 m |
| Total wheelbase | 34.44 m |
| Service mass | 312.9 t |
| Adhesion mass | 240.9 t |
| Total mass | 494.7 t |
| Rigid wheelbase | 5.16 m |
| Axle load | 30.1 t |
| Water capacity | 83,733 l |
| Fuel capacity | 25.4 t (coal) |
Boiler
| Property | Southern Pacific class AC-9 Standard Remove |
|---|---|
| Grate area | 12.96 m² |
| Firebox surface | 54.72 m² |
| Tube heating surface | 587.984 m² |
| Evaporative heating surface | 642.704 m² |
| Superheater surface | 263.009 m² |
| Total heating surface | 905.7 m² |
Power plant
| Property | Southern Pacific class AC-9 Standard Remove |
|---|---|
| Driver diameter | 1,613 mm |
| Boiler pressure | 17.9 bar |
| Expansion type | simple expansion |
| Cylinders | four, 610 x 813 mm |
Power
| Property | Southern Pacific class AC-9 Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 4,474 kW (6,083 PS) |
| Starting effort | 570.7 kN |
Calculated values
| Property | Southern Pacific class AC-9 Standard Remove |
|---|---|
| Factor of adhesion | 1 : 4.14 |
| Optimal speed | 48 km/h |
| Power-to-weight ratio | 14.3 kW/t |
| Heating Surface Equivalent | 1,442.3 m² |
| Cylinder volume/HSE | 1 : 657.90 |
| Adhesive weight/Total | 1 : 1.30 |
| Tractive force/Heating surface | 1 : 13.16 |
| Grate area/Heating surface | 1 : 69.89 |
| Firebox/Tube surface | 1 : 10.75 |
| Total/Superheater | 1 : 2.44 |
