Great North of Scotland classes V and F
London & North Eastern class D40
The class V of the Great North of Scotland was the direct successor of the class T, one of the changes being the larger side-window cab. It was a 4-4-0 express locomotive with drivers of 6 ft 1 in designed by locomotive superintendent William Pickersgill. Ten were built by Neilson, Reid & Co., but decreased traffic volumes and financial problems of the GNSR led to the last five being delivered to the South Eastern & Chatham Railway instead, becoming class G. Eight more were built by the GNSR's own Inverurie works between 1909 and 1915.
In 1920, T.E. Heywood introduced a superheated variant that was called class F. Six were produced by North British in the same year and two more followed from Inverurie in 1921, bringing the total number to 21. All locomotives of classes V and F were taken over by the LNER in 1923 and designated class D40. The first one was withdrawn in 1947 and 18 came to British Railways. The last one to be withdrawn was “Gordon Highlander” in 1958. It is the only one that was preserved and can be found in Museum of Scottish Railways.
Technical data
General
| Property | V | F |
|---|---|---|
| Built | 1899, 1909-1915 | 1920-1921 |
| Manufacturers | Neilson, Reid & Co., Inverurie | North British, Inverurie |
| Wheel arrangement | 4-4-0 (American) | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | V | F |
|---|---|---|
| Wheelbase | 6.64 m | |
| Total wheelbase | 13.18 m | |
| Service mass | 45.6 t | 47.7 t |
| Adhesion mass | 32.4 t | 33.7 t |
| Total mass | 83.3 t | 85.7 t |
| Rigid wheelbase | 2.67 m | |
| Axle load | 16.2 t | 16.8 t |
| Water capacity | 16,364 l | |
| Fuel capacity | 5.6 t (coal) | |
Boiler
| Property | V | F |
|---|---|---|
| Grate area | 1.691 m² | |
| Firebox surface | 10.545 m² | 9.848 m² |
| Tube heating surface | 101.59 m² | 70.049 m² |
| Evaporative heating surface | 112.134 m² | 79.897 m² |
| Total heating surface | 112.1 m² | 92.9 m² |
| Superheater surface | 13.006 m² | |
Power plant
| Property | V | F |
|---|---|---|
| Driver diameter | 1,854 mm | |
| Boiler pressure | 11.4 bar | |
| Expansion type | simple expansion | |
| Cylinders | two, 457 x 660 mm | |
Power
| Property | V | F |
|---|---|---|
| Power source | steam | |
| Estimated power | 485 kW (659 PS) | 559 kW (760 PS) |
| Starting effort | 72.0 kN | |
Calculated values
| Property | V | F |
|---|---|---|
| Factor of adhesion | 1 : 4.42 | 1 : 4.60 |
| Optimal speed | 42 km/h | 48 km/h |
| Power-to-weight ratio | 10.6 kW/t | 11.7 kW/t |
| Heating Surface Equivalent | 164.9 m² | 155.1 m² |
| Cylinder volume/HSE | 1 : 1,315.30 | 1 : 1,397.62 |
| Adhesive weight/Total | 1 : 1.41 | |
| Tractive force/Heating surface | 1 : 13.41 | 1 : 16.18 |
| Grate area/Heating surface | 1 : 66.31 | 1 : 54.94 |
| Firebox/Tube surface | 1 : 9.63 | 1 : 7.11 |
| Total/Superheater | 1 : 6.14 | |