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Chicago & North Western class D
The class of the D Chicago & North Western was one of the first Atlantics with a wide firebox . With this arrangement, it was quickly discovered that firing was much easier and that much power could even be delivered ...
General
| Property | Chicago & North Western class D superheated |
|---|---|
| Built | 1900-1908 |
| Manufacturers | CNW |
| Wheel arrangement | 4-4-2 (Atlantic) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Chicago & North Western class D superheated |
|---|---|
| Wheelbase | 8.15 m |
| Rigid wheelbase | 2.13 m |
| Total wheelbase | 17.67 m |
| Service weight | 82.3 t |
| Adhesive weight | 44.2 t |
| Axle load | 22.1 t |
| Total weight | 147.6 t |
| Water capacity | 28,391 l |
| Fuel capacity | 9.1 t (coal) |
Boiler
| Property | Chicago & North Western class D superheated |
|---|---|
| Grate area | 4.301 m² |
| Firebox surface | 18.488 m² |
| Tube heating surface | 183.484 m² |
| Evaporative heating surface | 201.971 m² |
| Superheater surface | 40.784 m² |
| Total heating surface | 242.8 m² |
Power plant
| Property | Chicago & North Western class D superheated |
|---|---|
| Driver diameter | 2,057 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 508 x 660 mm |
Power
| Property | Chicago & North Western class D superheated |
|---|---|
| Power source | steam |
| Estimated power | 1,342 kW (1,825 PS) |
| Starting effort | 97.1 kN |
Calculated values
| Property | Chicago & North Western class D superheated |
|---|---|
| Factor of adhesion | 1 : 4.47 |
| Optimal speed | 85 km/h |
| Power-to-weight ratio | 16.3 kW/t |
| Heating Surface Equivalent | 376.0 m² |
| Cylinder volume/HSE | 1 : 712.02 |
| Adhesive weight/Total | 1 : 1.86 |
| Tractive force/Heating surface | 1 : 8.35 |
| Grate area/Heating surface | 1 : 56.44 |
| Firebox/Tube surface | 1 : 9.92 |
| Total/Superheater | 1 : 4.95 |
