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Northern Pacific class Z
The class Z of the Northern Pacific were 2-6-6-2 Mallet locomotives built for low-speed helper service which were virtually identical to the Great Northern's class L-1. They were among the first of this wheel arrangem...
General
| Property | Northern Pacific class ZRemove |
|---|---|
| Built | 1907 |
| Manufacturers | Baldwin |
| Wheel arrangement | 2-6-6-2 (Mallet Mogul) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Northern Pacific class ZRemove |
|---|---|
| Wheelbase | 13.67 m |
| Rigid wheelbase | 3.05 m |
| Total wheelbase | 22.30 m |
| Service weight | 161 t |
| Adhesive weight | 143.3 t |
| Axle load | 25.9 t |
| Total weight | 230.3 t |
| Water capacity | 30,283 l |
| Fuel capacity | 11.8 t (coal) |
Boiler
| Property | Northern Pacific class ZRemove |
|---|---|
| Grate area | 7.246 m² |
| Firebox surface | 20.903 m² |
| Tube heating surface | 500.098 m² |
| Evaporative heating surface | 521.001 m² |
| Total heating surface | 521.0 m² |
Power plant
| Property | Northern Pacific class ZRemove |
|---|---|
| Driver diameter | 1,397 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | compound |
| Cylinders | four, HP: 546 x 813 mm and LP: 838 x 813 mm |
Power
| Property | Northern Pacific class ZRemove |
|---|---|
| Power source | steam |
| Estimated power | 1,491 kW (2,027 PS) |
| Starting effort | 285.5 kN |
| Starting effort simple | 342.7 kN |
Calculated values
| Property | Northern Pacific class ZRemove |
|---|---|
| Factor of adhesion | 1 : 4.92 |
| Optimal speed | 32 km/h |
| Power-to-weight ratio | 9.3 kW/t |
| Heating Surface Equivalent | 625.5 m² |
| Cylinder volume/HSE | 1 : 1,325.73 |
| Adhesive weight/Total | 1 : 1.12 |
| Tractive force/Heating surface | 1 : 11.45 |
| Grate area/Heating surface | 1 : 71.90 |
| Firebox/Tube surface | 1 : 23.92 |
