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Missouri Pacific class MT-73
After World War I, the Missouri Pacific ordered a 4-8-2 that would be faster than the MT-63, but had to be limited to an adhesive weight of 226,000 pounds . The goal was to use the heating surface as best as possible,...
| Missouri Pacific class MT-73Remove | |
|---|---|
| Variant | |
| Built | 1927, 1930 |
| Manufacturers | ALCO |
| Wheel arrangement | 2D1 |
| Gauge | 1435 mm |
| Length | 33668 mm |
| Service mass | 179623 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Missouri Pacific class MT-73Remove |
|---|---|
| Built | 1927, 1930 |
| Manufacturers | ALCO |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Missouri Pacific class MT-73Remove |
|---|---|
| Length | 33.67 m |
| Length loco | 17.11 m |
| Wheelbase | 12.85 m |
| Total wheelbase | 26.91 m |
| Empty mass | 159.7 t |
| Service mass | 179.6 t |
| Adhesion mass | 121.3 t |
| Total mass | 324.8 t |
| Rigid wheelbase | 5.97 m |
| Axle load | 30.3 t |
| Water capacity | 52,996 l |
| Fuel capacity | 11.8 t (coal) |
Boiler
| Property | Missouri Pacific class MT-73Remove |
|---|---|
| Grate area | 7.832 m² |
| Firebox surface | 43.2 m² |
| Tube heating surface | 433.021 m² |
| Evaporative heating surface | 476.221 m² |
| Superheater surface | 125.605 m² |
| Total heating surface | 601.8 m² |
Power plant
| Property | Missouri Pacific class MT-73Remove |
|---|---|
| Driver diameter | 1,854 mm |
| Boiler pressure | 17.2 bar |
| Expansion type | simple expansion |
| Cylinders | two, 686 x 762 mm |
Power
| Property | Missouri Pacific class MT-73Remove |
|---|---|
| Power source | steam |
| Estimated power | 3,057 kW (4,156 PS) |
| Starting effort | 283.2 kN |
Calculated values
| Property | Missouri Pacific class MT-73Remove |
|---|---|
| Factor of adhesion | 1 : 4.20 |
| Optimal speed | 66 km/h |
| Power-to-weight ratio | 17.0 kW/t |
| Heating Surface Equivalent | 943.4 m² |
| Cylinder volume/HSE | 1 : 596.70 |
| Adhesive weight/Total | 1 : 1.48 |
| Tractive force/Heating surface | 1 : 9.83 |
| Grate area/Heating surface | 1 : 76.84 |
| Firebox/Tube surface | 1 : 10.02 |
| Total/Superheater | 1 : 3.79 |
