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Missouri Pacific class P-69
While the first 4-6-2 locomotives still had a narrow firebox and did not bring much advantage over the 4-6-0, the later, classic Pacifics were characterized by a wide firebox above the trailing axle . This allowed a s...
General
| Property | Missouri Pacific class P-69 superheated |
|---|---|
| Built | 1916 |
| Manufacturers | Missouri Pacific |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Missouri Pacific class P-69 superheated |
|---|---|
| Wheelbase | 9.65 m |
| Rigid wheelbase | 3.76 m |
| Total wheelbase | 16.82 m |
| Service weight | 87.5 t |
| Adhesive weight | 56.2 t |
| Axle load | 18.7 t |
| Total weight | 154.9 t |
| Water capacity | 26,498 l |
| Fuel capacity | 12.7 t (coal) |
Boiler
| Property | Missouri Pacific class P-69 superheated |
|---|---|
| Grate area | 3.939 m² |
| Firebox surface | 20.532 m² |
| Tube heating surface | 195.189 m² |
| Evaporative heating surface | 215.721 m² |
| Superheater surface | 39.948 m² |
| Total heating surface | 255.7 m² |
Power plant
| Property | Missouri Pacific class P-69 superheated |
|---|---|
| Driver diameter | 1,753 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 533 x 660 mm |
Power
| Property | Missouri Pacific class P-69 superheated |
|---|---|
| Power source | steam |
| Estimated power | 1,119 kW (1,521 PS) |
| Starting effort | 125.7 kN |
Calculated values
| Property | Missouri Pacific class P-69 superheated |
|---|---|
| Factor of adhesion | 1 : 4.39 |
| Optimal speed | 55 km/h |
| Power-to-weight ratio | 12.8 kW/t |
| Heating Surface Equivalent | 398.3 m² |
| Cylinder volume/HSE | 1 : 741.05 |
| Adhesive weight/Total | 1 : 1.56 |
| Tractive force/Heating surface | 1 : 10.27 |
| Grate area/Heating surface | 1 : 64.91 |
| Firebox/Tube surface | 1 : 9.51 |
| Total/Superheater | 1 : 5.40 |
