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Northern Pacific classes Z-6 to Z-8
The first Challenger locomotives, i.e. the wheel arrangement 4-6-6-4, were built in 1936. In addition to the well-known Challenger of the Union Pacific, this was the Z-6 class of the Northern Pacific. Since these had ...
| Northern Pacific classes Z-6 to Z-8Remove | |
|---|---|
| Variant | |
| Built | 1943-1944 |
| Manufacturers | ALCO |
| Wheel arrangement | (2C)C2 ma |
| Gauge | 1435 mm |
| Length | |
| Service mass | 292114 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Northern Pacific classes Z-6 to Z-8Remove |
|---|---|
| Built | 1943-1944 |
| Manufacturers | ALCO |
| Wheel arrangement | 4-6-6-4 (Challenger) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Northern Pacific classes Z-6 to Z-8Remove |
|---|---|
| Wheelbase | 18.95 m |
| Total wheelbase | 33.54 m |
| Service mass | 292.1 t |
| Adhesion mass | 201.4 t |
| Total mass | 490.8 t |
| Rigid wheelbase | 7.52 m |
| Axle load | 33.6 t |
| Water capacity | 94,635 l |
| Fuel capacity | 24.5 t (coal) |
Boiler
| Property | Northern Pacific classes Z-6 to Z-8Remove |
|---|---|
| Grate area | 14.149 m² |
| Firebox surface | 70.235 m² |
| Tube heating surface | 463.865 m² |
| Evaporative heating surface | 534.1 m² |
| Superheater surface | 195.561 m² |
| Total heating surface | 729.7 m² |
Power plant
| Property | Northern Pacific classes Z-6 to Z-8Remove |
|---|---|
| Driver diameter | 1,778 mm |
| Boiler pressure | 17.9 bar |
| Expansion type | simple expansion |
| Cylinders | four, 584 x 813 mm |
Power
| Property | Northern Pacific classes Z-6 to Z-8Remove |
|---|---|
| Power source | steam |
| Estimated power | 4,847 kW (6,590 PS) |
| Starting effort | 475.5 kN |
Calculated values
| Property | Northern Pacific classes Z-6 to Z-8Remove |
|---|---|
| Factor of adhesion | 1 : 4.16 |
| Optimal speed | 63 km/h |
| Power-to-weight ratio | 16.6 kW/t |
| Heating Surface Equivalent | 1,276.4 m² |
| Cylinder volume/HSE | 1 : 682.76 |
| Adhesive weight/Total | 1 : 1.45 |
| Tractive force/Heating surface | 1 : 13.61 |
| Grate area/Heating surface | 1 : 51.57 |
| Firebox/Tube surface | 1 : 6.60 |
| Total/Superheater | 1 : 2.73 |
