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Great Northern (IE) class PP
The class PP was a 4-4-0 introduced in 1896 by Charles Clifford, originally designed for mail trains between Dublin and Belfast. At this time, they were the heaviest and most powerful locomotives in Ireland. Compared ...
General
| Property | Great Northern (IE) class PP superheated |
|---|---|
| Built | 1917-1930 |
| Manufacturers | Dundalk |
| Wheel arrangement | 4-4-0 (American) |
| Gauge | 1,600 mm (Irish broad gauge) |
Dimensions and weights
| Property | Great Northern (IE) class PP superheated |
|---|---|
| Wheelbase | 6.21 m |
| Total wheelbase | 12.43 m |
| Service weight | 45.7 t |
| Adhesive weight | 30.7 t |
| Axle load | 15.4 t |
Boiler
| Property | Great Northern (IE) class PP superheated |
|---|---|
| Grate area | 1.695 m² |
| Firebox surface | 9.987 m² |
| Tube heating surface | 77.853 m² |
| Evaporative heating surface | 87.84 m² |
| Superheater surface | 17.624 m² |
| Total heating surface | 105.5 m² |
Power plant
| Property | Great Northern (IE) class PP superheated |
|---|---|
| Driver diameter | 2,007 mm |
| Boiler pressure | 12.1 bar |
| Expansion type | simple expansion |
| Cylinders | two, 457 x 610 mm |
Power
| Property | Great Northern (IE) class PP superheated |
|---|---|
| Power source | steam |
| Estimated power | 597 kW (812 PS) |
| Starting effort | 65.1 kN |
Calculated values
| Property | Great Northern (IE) class PP superheated |
|---|---|
| Factor of adhesion | 1 : 4.62 |
| Optimal speed | 56 km/h |
| Power-to-weight ratio | 13.1 kW/t |
| Heating Surface Equivalent | 173.0 m² |
| Cylinder volume/HSE | 1 : 1,156.84 |
| Adhesive weight/Total | 1 : 1.49 |
| Tractive force/Heating surface | 1 : 12.90 |
| Grate area/Heating surface | 1 : 62.22 |
| Firebox/Tube surface | 1 : 7.80 |
| Total/Superheater | 1 : 4.98 |
