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North British class H
When the North British Railway needed new express locomotives which were much more powerful than the existing 4-4-0, William Reid developed the Atlantic that was later called class H. It was the only five-axle tender ...
General
| Property | North British class H as built |
|---|---|
| Built | 1906, 1911, 1921 |
| Manufacturers | North British, Robert Stephenson & Co. |
| Wheel arrangement | 4-4-2 (Atlantic) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | North British class H as built |
|---|---|
| Length | 17.98 m |
| Wheelbase | 8.47 m |
| Rigid wheelbase | 2.24 m |
| Total wheelbase | 16.21 m |
| Empty weight | 68.2 t |
| Service weight | 75.6 t |
| Adhesive weight | 40.6 t |
| Axle load | 20.3 t |
| Total weight | 121.7 t |
| Water capacity | 19,275 l |
| Fuel capacity | 7.1 t (coal) |
Boiler
| Property | North British class H as built |
|---|---|
| Grate area | 2.648 m² |
| Firebox surface | 17.447 m² |
| Tube heating surface | 192.142 m² |
| Evaporative heating surface | 209.589 m² |
| Total heating surface | 209.6 m² |
Power plant
| Property | North British class H as built |
|---|---|
| Driver diameter | 2,057 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 508 x 711 mm |
Power
| Property | North British class H as built |
|---|---|
| Power source | steam |
| Estimated power | 895 kW (1,217 PS) |
| Starting effort | 104.6 kN |
Calculated values
| Property | North British class H as built |
|---|---|
| Factor of adhesion | 1 : 3.81 |
| Optimal speed | 53 km/h |
| Power-to-weight ratio | 11.8 kW/t |
| Heating Surface Equivalent | 296.8 m² |
| Cylinder volume/HSE | 1 : 971.27 |
| Adhesive weight/Total | 1 : 1.86 |
| Tractive force/Heating surface | 1 : 10.42 |
| Grate area/Heating surface | 1 : 79.15 |
| Firebox/Tube surface | 1 : 11.01 |
