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Ferrocarriles Nacionales classes PR-7 and PR-8
Unusual for a North-American 4-8-0, the NdeM ordered their classes PR-7 and PR-8 mainly for passenger service. A thought behind this may have been that a Twelve-wheeler had more adhesive weight than a similarly sized ...
General
| Property | Ferrocarriles Nacionales classes PR-7 and PR-8 Remove |
|---|---|
| Built | 1935 |
| Manufacturers | Baldwin |
| Wheel arrangement | 4-8-0 (Twelve-wheeler) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Ferrocarriles Nacionales classes PR-7 and PR-8 Remove |
|---|---|
| Wheelbase | 9.40 m |
| Rigid wheelbase | 5.49 m |
| Total wheelbase | 20.54 m |
| Service weight | 130.6 t |
| Adhesive weight | 104.3 t |
| Axle load | 26.1 t |
| Total weight | 207.4 t |
| Water capacity | 32,176 l |
| Fuel capacity | 1.6 t (oil) |
Boiler
| Property | Ferrocarriles Nacionales classes PR-7 and PR-8 Remove |
|---|---|
| Grate area | 6.197 m² |
| Firebox surface | 27.778 m² |
| Tube heating surface | 332.129 m² |
| Evaporative heating surface | 359.907 m² |
| Superheater surface | 95.504 m² |
| Total heating surface | 455.4 m² |
Power plant
| Property | Ferrocarriles Nacionales classes PR-7 and PR-8 Remove |
|---|---|
| Driver diameter | 1,702 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 711 x 711 mm |
Power
| Property | Ferrocarriles Nacionales classes PR-7 and PR-8 Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,386 kW (3,244 PS) |
| Starting effort | 247.8 kN |
Calculated values
| Property | Ferrocarriles Nacionales classes PR-7 and PR-8 Remove |
|---|---|
| Factor of adhesion | 1 : 4.13 |
| Optimal speed | 60 km/h |
| Power-to-weight ratio | 18.3 kW/t |
| Heating Surface Equivalent | 689.8 m² |
| Cylinder volume/HSE | 1 : 819.16 |
| Adhesive weight/Total | 1 : 1.25 |
| Tractive force/Heating surface | 1 : 11.36 |
| Grate area/Heating surface | 1 : 73.49 |
| Firebox/Tube surface | 1 : 11.96 |
| Total/Superheater | 1 : 3.77 |
