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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...
| Chicago, Rock Island & Pacific (Rock Island) class M-50Remove | |
|---|---|
| Variant | production |
| Built | 1920-1924 |
| Manufacturers | ALCO |
| Wheel arrangement | 2D1 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 171458 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50production |
|---|---|
| Built | 1920-1924 |
| Manufacturers | ALCO |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50production |
|---|---|
| Wheelbase | 12.88 m |
| Total wheelbase | 26.92 m |
| Service mass | 171.5 t |
| Adhesion mass | 115.8 t |
| Total mass | 259.5 t |
| Rigid wheelbase | 6.05 m |
| Axle load | 28.9 t |
| Water capacity | 37,854 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50production |
|---|---|
| Grate area | 5.853 m² |
| Firebox surface | 36.883 m² |
| Tube heating surface | 398.369 m² |
| Evaporative heating surface | 435.251 m² |
| Superheater surface | 111.112 m² |
| Total heating surface | 546.4 m² |
Power plant
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50production |
|---|---|
| Driver diameter | 1,880 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 711 x 711 mm |
Power
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50production |
|---|---|
| Power source | steam |
| Estimated power | 2,461 kW (3,346 PS) |
| Starting effort | 224.3 kN |
Calculated values
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50production |
|---|---|
| Factor of adhesion | 1 : 5.06 |
| Optimal speed | 68 km/h |
| Power-to-weight ratio | 14.4 kW/t |
| Heating Surface Equivalent | 841.9 m² |
| Cylinder volume/HSE | 1 : 671.18 |
| Adhesive weight/Total | 1 : 1.48 |
| Tractive force/Heating surface | 1 : 8.58 |
| Grate area/Heating surface | 1 : 93.35 |
| Firebox/Tube surface | 1 : 10.80 |
| Total/Superheater | 1 : 3.92 |
