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Midland Great Western class A
The class A were the heaviest locomotives in Ireland at the time they entered service. Their job was to haul heavy express trains between the east and west coasts. Due to their high axle load , they could not be used ...
General
| Property | Midland Great Western class A as built |
|---|---|
| Built | 1902-1905 |
| Manufacturers | Broadstone |
| Wheel arrangement | 4-4-0 (American) |
| Gauge | 1,600 mm (Irish broad gauge) |
Dimensions and weights
| Property | Midland Great Western class A as built |
|---|---|
| Length | 16.62 m |
| Length loco | 9.54 m |
| Wheelbase | 6.86 m |
| Rigid wheelbase | 2.82 m |
| Service weight | 51.7 t |
| Adhesive weight | 34.7 t |
| Axle load | 18.2 t |
| Total weight | 88.1 t |
| Water capacity | 13,639 l |
| Fuel capacity | 5.1 t (coal) |
Boiler
| Property | Midland Great Western class A as built |
|---|---|
| Grate area | 1.858 m² |
| Firebox surface | 13.935 m² |
| Tube heating surface | 112.691 m² |
| Evaporative heating surface | 126.627 m² |
| Total heating surface | 126.6 m² |
Power plant
| Property | Midland Great Western class A as built |
|---|---|
| Driver diameter | 1,905 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | two, 457 x 660 mm |
Power
| Property | Midland Great Western class A as built |
|---|---|
| Power source | steam |
| Estimated power | 559 kW (760 PS) |
| Starting effort | 76.4 kN |
Calculated values
| Property | Midland Great Western class A as built |
|---|---|
| Factor of adhesion | 1 : 4.45 |
| Optimal speed | 45 km/h |
| Power-to-weight ratio | 10.8 kW/t |
| Heating Surface Equivalent | 196.3 m² |
| Cylinder volume/HSE | 1 : 1,104.63 |
| Adhesive weight/Total | 1 : 1.49 |
| Tractive force/Heating surface | 1 : 12.61 |
| Grate area/Heating surface | 1 : 68.15 |
| Firebox/Tube surface | 1 : 8.09 |
