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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 | rebuilt M-50a |
| Built | 1941-1944 |
| Manufacturers | Silvis |
| Wheel arrangement | 2D1 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 171685 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50rebuilt M-50a |
|---|---|
| Built | 1941-1944 |
| Manufacturers | Silvis |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50rebuilt M-50a |
|---|---|
| Wheelbase | 12.83 m |
| Total wheelbase | 26.77 m |
| Service mass | 171.7 t |
| Adhesion mass | 115 t |
| Total mass | 327.5 t |
| Rigid wheelbase | 6.05 m |
| Axle load | 28.7 t |
| Water capacity | 75,708 l |
| Fuel capacity | 18,927 l (oil) |
Boiler
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50rebuilt M-50a |
|---|---|
| Grate area | 5.853 m² |
| Firebox surface | 34.188 m² |
| Tube heating surface | 378.023 m² |
| Evaporative heating surface | 412.211 m² |
| Superheater surface | 118.544 m² |
| Total heating surface | 530.8 m² |
Power plant
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50rebuilt M-50a |
|---|---|
| Driver diameter | 1,880 mm |
| Boiler pressure | 15.2 bar |
| Expansion type | simple expansion |
| Cylinders | two, 660 x 711 mm |
Power
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50rebuilt M-50a |
|---|---|
| Power source | steam |
| Estimated power | 2,610 kW (3,549 PS) |
| Starting effort | 212.8 kN |
Calculated values
| Property | Chicago, Rock Island & Pacific (Rock Island) class M-50rebuilt M-50a |
|---|---|
| Factor of adhesion | 1 : 5.30 |
| Optimal speed | 76 km/h |
| Power-to-weight ratio | 15.2 kW/t |
| Heating Surface Equivalent | 820.2 m² |
| Cylinder volume/HSE | 1 : 594.00 |
| Adhesive weight/Total | 1 : 1.49 |
| Tractive force/Heating surface | 1 : 8.37 |
| Grate area/Heating surface | 1 : 90.68 |
| Firebox/Tube surface | 1 : 11.06 |
| Total/Superheater | 1 : 3.48 |
