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Pere Marquette classes N to N2
For use in front of fast freight trains, the Pere Marquette also chose the 2-8-4 “Berkshire” wheel arrangement in the late 1930s. It was able to develop great power at speeds of up to 70 mph thanks to the large firebo...
General
| Property | Pere Marquette classes N to N2Remove |
|---|---|
| Built | 1937, 1941, 1944 |
| Manufacturers | Lima |
| Wheel arrangement | 2-8-4 (Berkshire) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Pere Marquette classes N to N2Remove |
|---|---|
| Length | 31.00 m |
| Wheelbase | 12.80 m |
| Rigid wheelbase | 5.55 m |
| Total wheelbase | 26.89 m |
| Service weight | 200.7 t |
| Adhesive weight | 125.9 t |
| Axle load | 31.5 t |
| Total weight | 365.6 t |
| Water capacity | 83,279 l |
| Fuel capacity | 20 t (coal) |
Boiler
| Property | Pere Marquette classes N to N2Remove |
|---|---|
| Grate area | 8.389 m² |
| Firebox surface | 43.293 m² |
| Tube heating surface | 400.505 m² |
| Evaporative heating surface | 443.798 m² |
| Superheater surface | 179.489 m² |
| Total heating surface | 623.3 m² |
Power plant
| Property | Pere Marquette classes N to N2Remove |
|---|---|
| Driver diameter | 1,753 mm |
| Boiler pressure | 16.9 bar |
| Expansion type | simple expansion |
| Cylinders | two, 660 x 864 mm |
Power
| Property | Pere Marquette classes N to N2Remove |
|---|---|
| Power source | steam |
| Estimated power | 3,356 kW (4,563 PS) |
| Top speed | 113 km/h |
| Starting effort | 308.6 kN |
Calculated values
| Property | Pere Marquette classes N to N2Remove |
|---|---|
| Factor of adhesion | 1 : 4.00 |
| Optimal speed | 66 km/h |
| Power-to-weight ratio | 16.7 kW/t |
| Heating Surface Equivalent | 1,019.2 m² |
| Cylinder volume/HSE | 1 : 580.46 |
| Adhesive weight/Total | 1 : 1.59 |
| Tractive force/Heating surface | 1 : 10.34 |
| Grate area/Heating surface | 1 : 74.30 |
| Firebox/Tube surface | 1 : 9.25 |
| Total/Superheater | 1 : 2.47 |
