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Great Northern (UK) class N1
After the L1, Ivatt developed another tank locomotive for the GNR for use on the city lines of London. In order to be better suited for higher speeds, there were only three driving axles with 5 ft 8 in wheels. As with...
General
| Property | Great Northern (UK) class N1 as built |
|---|---|
| Built | 1906-1912 |
| Manufacturers | Doncaster |
| Wheel arrangement | 0-6-2T (Webb) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Great Northern (UK) class N1 as built |
|---|---|
| Length | 11.16 m |
| Wheelbase | 7.24 m |
| Rigid wheelbase | 4.95 m |
| Service weight | 66.9 t |
| Adhesive weight | 52.2 t |
| Axle load | 18.3 t |
| Water capacity | 7,276 l |
| Fuel capacity | 4.1 t (coal) |
Boiler
| Property | Great Northern (UK) class N1 as built |
|---|---|
| Grate area | 1.932 m² |
| Firebox surface | 11.139 m² |
| Tube heating surface | 104.99 m² |
| Evaporative heating surface | 116.129 m² |
| Total heating surface | 116.1 m² |
Power plant
| Property | Great Northern (UK) class N1 as built |
|---|---|
| Driver diameter | 1,727 mm |
| Boiler pressure | 11.7 bar |
| Expansion type | simple expansion |
| Cylinders | two, 457 x 660 mm |
Power
| Property | Great Northern (UK) class N1 as built |
|---|---|
| Power source | steam |
| Estimated power | 597 kW (812 PS) |
| Starting effort | 79.6 kN |
Calculated values
| Property | Great Northern (UK) class N1 as built |
|---|---|
| Factor of adhesion | 1 : 6.43 |
| Optimal speed | 45 km/h |
| Power-to-weight ratio | 8.9 kW/t |
| Heating Surface Equivalent | 171.8 m² |
| Cylinder volume/HSE | 1 : 1,261.99 |
| Adhesive weight/Total | 1 : 1.28 |
| Tractive force/Heating surface | 1 : 14.32 |
| Grate area/Heating surface | 1 : 60.11 |
| Firebox/Tube surface | 1 : 9.43 |
