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North Eastern and London & North Eastern Raven class A2
The A2 was a Pacific express locomotive designed by Vincent Raven for the North Eastern Railway shortly before the grouping into the LNER. It was based on the class Z Atlantic with an additional driving axle and a lon...
| North Eastern and London & North Eastern Raven class A2Remove | |
|---|---|
| Variant | Standard |
| Built | 1922, 1924 |
| Manufacturers | Darlington |
| Wheel arrangement | 2C1 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 98557 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | North Eastern and London & North Eastern Raven class A2 Standard Remove |
|---|---|
| Built | 1922, 1924 |
| Manufacturers | Darlington |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | North Eastern and London & North Eastern Raven class A2 Standard Remove |
|---|---|
| Wheelbase | 11.33 m |
| Total wheelbase | 18.90 m |
| Service mass | 98.6 t |
| Adhesion mass | 61 t |
| Total mass | 142.3 t |
| Rigid wheelbase | 4.57 m |
| Axle load | 20.3 t |
| Water capacity | 18,753 l |
| Fuel capacity | 5.6 t (coal) |
Boiler
| Property | North Eastern and London & North Eastern Raven class A2 Standard Remove |
|---|---|
| Grate area | 3.855 m² |
| Firebox surface | 19.603 m² |
| Tube heating surface | 205.409 m² |
| Evaporative heating surface | 225.011 m² |
| Superheater surface | 64.753 m² |
| Total heating surface | 289.8 m² |
Power plant
| Property | North Eastern and London & North Eastern Raven class A2 Standard Remove |
|---|---|
| Driver diameter | 2,032 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | three, 483 x 660 mm |
Power
| Property | North Eastern and London & North Eastern Raven class A2 Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,641 kW (2,231 PS) |
| Starting effort | 133.1 kN |
Calculated values
| Property | North Eastern and London & North Eastern Raven class A2 Standard Remove |
|---|---|
| Factor of adhesion | 1 : 4.49 |
| Optimal speed | 76 km/h |
| Power-to-weight ratio | 16.7 kW/t |
| Heating Surface Equivalent | 452.5 m² |
| Cylinder volume/HSE | 1 : 800.83 |
| Adhesive weight/Total | 1 : 1.62 |
| Tractive force/Heating surface | 1 : 9.59 |
| Grate area/Heating surface | 1 : 75.17 |
| Firebox/Tube surface | 1 : 10.48 |
| Total/Superheater | 1 : 3.47 |
