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Chicago, Rock Island & Pacific (Rock Island) class M-50
One of the first railroads in the USA to purchase the 4-8-2 “Mountain” wheel arrangement was the Rock Island. In 1913, however, only the two prototypes of the M-50 class were initially delivered. They had square cylin...
General
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50 prototypes |
|---|---|
| Built | 1913 |
| Manufacturers | ALCO |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50 prototypes |
|---|---|
| Wheelbase | 11.86 m |
| Rigid wheelbase | 5.49 m |
| Total wheelbase | 21.40 m |
| Service weight | 151 t |
| Adhesive weight | 101.6 t |
| Axle load | 25.4 t |
| Total weight | 223.8 t |
| Water capacity | 32,176 l |
| Fuel capacity | 12.7 t (coal) |
Boiler
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50 prototypes |
|---|---|
| Grate area | 5.825 m² |
| Firebox surface | 28.986 m² |
| Tube heating surface | 353.496 m² |
| Evaporative heating surface | 382.482 m² |
| Superheater surface | 87.701 m² |
| Total heating surface | 470.2 m² |
Power plant
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50 prototypes |
|---|---|
| Driver diameter | 1,753 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | two, 711 x 711 mm |
Power
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50 prototypes |
|---|---|
| Power source | steam |
| Estimated power | 2,088 kW (2,839 PS) |
| Starting effort | 216.5 kN |
Calculated values
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50 prototypes |
|---|---|
| Factor of adhesion | 1 : 4.60 |
| Optimal speed | 60 km/h |
| Power-to-weight ratio | 13.8 kW/t |
| Heating Surface Equivalent | 702.8 m² |
| Cylinder volume/HSE | 1 : 804.00 |
| Adhesive weight/Total | 1 : 1.49 |
| Tractive force/Heating surface | 1 : 9.62 |
| Grate area/Heating surface | 1 : 80.72 |
| Firebox/Tube surface | 1 : 12.20 |
| Total/Superheater | 1 : 4.36 |
