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Missouri Pacific class P-73
In the Missouri Pacific class scheme, the designation P-73 stood for 4-6-2 express locomotives with a driver diameter of 73 inches or 1,854 mm. The class consisted of several batches built by two ALCO works between 19...
General
| Property | Missouri Pacific class P-73 6601-6629 |
|---|---|
| Built | 1924-1925 |
| Manufacturers | ALCO |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Missouri Pacific class P-73 6601-6629 |
|---|---|
| Length | 26.26 m |
| Wheelbase | 10.74 m |
| Rigid wheelbase | 3.96 m |
| Total wheelbase | 22.81 m |
| Service weight | 141.9 t |
| Adhesive weight | 89.7 t |
| Total weight | 258.2 t |
| Water capacity | 45,425 l |
| Fuel capacity | 25,022 l (oil) |
Boiler
| Property | Missouri Pacific class P-73 6601-6629 |
|---|---|
| Grate area | 6.299 m² |
| Firebox surface | 25.455 m² |
| Tube heating surface | 337.238 m² |
| Evaporative heating surface | 362.694 m² |
| Superheater surface | 91.045 m² |
| Total heating surface | 453.7 m² |
Power plant
| Property | Missouri Pacific class P-73 6601-6629 |
|---|---|
| Driver diameter | 1,854 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 686 x 711 mm |
Power
| Property | Missouri Pacific class P-73 6601-6629 |
|---|---|
| Power source | steam |
| Estimated power | 2,088 kW (2,839 PS) |
| Starting effort | 211.4 kN |
Calculated values
| Property | Missouri Pacific class P-73 6601-6629 |
|---|---|
| Factor of adhesion | 1 : 4.16 |
| Optimal speed | 61 km/h |
| Power-to-weight ratio | 14.7 kW/t |
| Heating Surface Equivalent | 672.1 m² |
| Cylinder volume/HSE | 1 : 781.81 |
| Adhesive weight/Total | 1 : 1.58 |
| Tractive force/Heating surface | 1 : 9.73 |
| Grate area/Heating surface | 1 : 72.03 |
| Firebox/Tube surface | 1 : 13.25 |
| Total/Superheater | 1 : 3.98 |
