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Great Northern (UK) class 120
To improve the running characteristics of underground locomotives running between Moorgate Street and the South of London, Patrick Stirling introduced the 0-4-4T wheel arrangement in 1872. In contrast to other cases, ...
General
| Property | Great Northern (UK) class 120Remove |
|---|---|
| Built | 1872-1881 |
| Manufacturers | Doncaster |
| Wheel arrangement | 0-4-4T (Forney) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Great Northern (UK) class 120Remove |
|---|---|
| Wheelbase | 6.86 m |
| Rigid wheelbase | 2.21 m |
| Service weight | 41.4 t |
| Adhesive weight | 26.7 t |
| Axle load | 14.9 t |
| Water capacity | 4,546 l |
| Fuel capacity | 1.5 t (coal) |
Boiler
| Property | Great Northern (UK) class 120Remove |
|---|---|
| Firebox surface | 7.525 m² |
| Tube heating surface | 74.88 m² |
| Evaporative heating surface | 82.405 m² |
| Total heating surface | 82.4 m² |
Power plant
| Property | Great Northern (UK) class 120Remove |
|---|---|
| Driver diameter | 1,702 mm |
| Boiler pressure | 11.7 bar |
| Expansion type | simple expansion |
| Cylinders | two, 444 x 610 mm |
Power
| Property | Great Northern (UK) class 120Remove |
|---|---|
| Power source | steam |
| Estimated power | 298 kW (405 PS) |
| Starting effort | 70.5 kN |
Calculated values
| Property | Great Northern (UK) class 120Remove |
|---|---|
| Factor of adhesion | 1 : 3.71 |
| Optimal speed | 26 km/h |
| Power-to-weight ratio | 7.2 kW/t |
| Heating Surface Equivalent | 120.0 m² |
| Cylinder volume/HSE | 1 : 1,576.23 |
| Adhesive weight/Total | 1 : 1.55 |
| Tractive force/Heating surface | 1 : 17.87 |
| Firebox/Tube surface | 1 : 9.95 |
