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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 ...
| Great Northern (IE) class PPRemove | |
|---|---|
| Variant | superheated |
| Built | 1917-1930 |
| Manufacturers | Dundalk |
| Wheel arrangement | 2B |
| Gauge | 1600 mm |
| Length | |
| Service mass | 45722 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Great Northern (IE) class PPsuperheated |
|---|---|
| Built | 1917-1930 |
| Manufacturers | Dundalk |
| Wheel arrangement | 4-4-0 (American) |
| Gauge | 1,600 mm |
Dimensions and weights
| Property | Great Northern (IE) class PPsuperheated |
|---|---|
| Wheelbase | 6.21 m |
| Total wheelbase | 12.43 m |
| Service mass | 45.7 t |
| Adhesion mass | 30.7 t |
| Axle load | 15.4 t |
Boiler
| Property | Great Northern (IE) class PPsuperheated |
|---|---|
| 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 PPsuperheated |
|---|---|
| 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 PPsuperheated |
|---|---|
| Power source | steam |
| Estimated power | 597 kW (812 PS) |
| Starting effort | 65.1 kN |
Calculated values
| Property | Great Northern (IE) class PPsuperheated |
|---|---|
| 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 |
