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Union Pacific class 9000
Since articulated freight locomotives in the 1920s did not yet reach the same speeds as ten-coupled locomotives, Union Pacific had the class 9000 developed with six coupled axles in one frame. The unique wheel arrange...
General
| Property | Union Pacific class 9000Remove |
|---|---|
| Built | 1926-1930 |
| Manufacturers | ALCO |
| Wheel arrangement | 4-12-2 (Union Pacific) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Union Pacific class 9000Remove |
|---|---|
| Length | 31.80 m |
| Wheelbase | 15.95 m |
| Rigid wheelbase | 9.35 m |
| Total wheelbase | 27.89 m |
| Service weight | 225.2 t |
| Adhesive weight | 160.6 t |
| Axle load | 27.2 t |
| Total weight | 366.1 t |
| Water capacity | 68,137 l |
| Fuel capacity | 20 t (coal) |
Boiler
| Property | Union Pacific class 9000Remove |
|---|---|
| Grate area | 10.057 m² |
| Firebox surface | 54.906 m² |
| Tube heating surface | 488.856 m² |
| Evaporative heating surface | 543.762 m² |
| Superheater surface | 237.832 m² |
| Total heating surface | 781.6 m² |
Power plant
| Property | Union Pacific class 9000Remove |
|---|---|
| Driver diameter | 1,702 mm |
| Boiler pressure | 15.2 bar |
| Expansion type | simple expansion |
| Cylinders | three, 686 x 813 mm |
Power
| Property | Union Pacific class 9000Remove |
|---|---|
| Power source | steam |
| Indicated power | 3,665 kW (4,983 PS) |
| Top speed | 97 km/h |
| Starting effort | 434.4 kN |
Calculated values
| Property | Union Pacific class 9000Remove |
|---|---|
| Factor of adhesion | 1 : 3.63 |
| Optimal speed | 51 km/h |
| Power-to-weight ratio | 16.3 kW/t |
| Heating Surface Equivalent | 1,294.0 m² |
| Cylinder volume/HSE | 1 : 696.10 |
| Adhesive weight/Total | 1 : 1.40 |
| Tractive force/Heating surface | 1 : 11.61 |
| Grate area/Heating surface | 1 : 77.72 |
| Firebox/Tube surface | 1 : 8.90 |
| Total/Superheater | 1 : 2.29 |
