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Brazil National Railways class 142N
Around 1950, André Chapelon developed two modern locomotive types with the 2-8-4 and 4-8-4 wheel arrangements for several Brazilian railway companies. While the machine shown here was designated 142N, the larger one w...
General
| Property | Brazil National Railways class 142NRemove |
|---|---|
| Built | 1951-1952 |
| Manufacturers | GELSA |
| Wheel arrangement | 2-8-4 (Berkshire) |
| Gauge | 1,000 mm (Meter gauge) |
Dimensions and weights
| Property | Brazil National Railways class 142NRemove |
|---|---|
| Length | 21.68 m |
| Wheelbase | 9.18 m |
| Rigid wheelbase | 4.11 m |
| Total wheelbase | 18.45 m |
| Service weight | 70 t |
| Adhesive weight | 40.4 t |
| Axle load | 10.1 t |
| Total weight | 142.8 t |
| Water capacity | 17,800 l |
| Fuel capacity | 12 t (coal) |
Boiler
| Property | Brazil National Railways class 142NRemove |
|---|---|
| Grate area | 4 m² |
| Firebox surface | 19.7 m² |
| Tube heating surface | 102.54 m² |
| Evaporative heating surface | 122.24 m² |
| Superheater surface | 45 m² |
| Total heating surface | 167.2 m² |
Power plant
| Property | Brazil National Railways class 142NRemove |
|---|---|
| Driver diameter | 1,270 mm |
| Boiler pressure | 15 bar |
| Expansion type | simple expansion |
| Cylinders | two, 434 x 560 mm |
Power
| Property | Brazil National Railways class 142NRemove |
|---|---|
| Power source | steam |
| Indicated power | 1,250 kW (1,700 PS) |
| Top speed | 60 km/h |
| Starting effort | 105.9 kN |
Calculated values
| Property | Brazil National Railways class 142NRemove |
|---|---|
| Factor of adhesion | 1 : 3.74 |
| Optimal speed | 72 km/h |
| Power-to-weight ratio | 17.9 kW/t |
| Heating Surface Equivalent | 310.7 m² |
| Cylinder volume/HSE | 1 : 533.20 |
| Adhesive weight/Total | 1 : 1.73 |
| Tractive force/Heating surface | 1 : 13.22 |
| Grate area/Heating surface | 1 : 41.81 |
| Firebox/Tube surface | 1 : 5.21 |
| Total/Superheater | 1 : 2.72 |
