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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 | 1921, 1923 |
| Manufacturers | ALCO |
| Wheel arrangement | 2D1 |
| Gauge | 1435 mm |
| Length | 26962 mm |
| Service mass | 151954 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Missouri Pacific class MT-73Remove |
|---|---|
| Built | 1921, 1923 |
| Manufacturers | ALCO |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Missouri Pacific class MT-73Remove |
|---|---|
| Length | 26.96 m |
| Length loco | 16.61 m |
| Wheelbase | 12.60 m |
| Total wheelbase | 23.52 m |
| Empty mass | 134.4 t |
| Service mass | 152 t |
| Adhesion mass | 102.5 t |
| Total mass | 239.4 t |
| Rigid wheelbase | 5.97 m |
| Axle load | 25.6 t |
| Water capacity | 37,854 l |
| Fuel capacity | 14.5 t (coal) |
Boiler
| Property | Missouri Pacific class MT-73Remove |
|---|---|
| Grate area | 6.225 m² |
| Firebox surface | 30.379 m² |
| Tube heating surface | 335.102 m² |
| Evaporative heating surface | 365.481 m² |
| Superheater surface | 100.707 m² |
| Total heating surface | 466.2 m² |
Power plant
| Property | Missouri Pacific class MT-73Remove |
|---|---|
| Driver diameter | 1,854 mm |
| Boiler pressure | 14.5 bar |
| Expansion type | simple expansion |
| Cylinders | two, 686 x 762 mm |
Power
| Property | Missouri Pacific class MT-73Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,461 kW (3,346 PS) |
| Starting effort | 237.9 kN |
Calculated values
| Property | Missouri Pacific class MT-73Remove |
|---|---|
| Factor of adhesion | 1 : 4.23 |
| Optimal speed | 63 km/h |
| Power-to-weight ratio | 16.2 kW/t |
| Heating Surface Equivalent | 718.8 m² |
| Cylinder volume/HSE | 1 : 783.19 |
| Adhesive weight/Total | 1 : 1.48 |
| Tractive force/Heating surface | 1 : 10.66 |
| Grate area/Heating surface | 1 : 74.89 |
| Firebox/Tube surface | 1 : 11.03 |
| Total/Superheater | 1 : 3.63 |
