Great North of Scotland No. 28 to 36
London & North Eastern class D47/2
William Cowan joined the Great North of Scotland in 1857 as Chief Engineer and soon had to order new locomotives due to growth in traffic. The three locomotives delivered by Robert Stephenson & Co. in 1861 were among the first in Britain to have a 4-4-0 wheel arrangement. Six more followed two years later. A short time later a similar type was built with the same cylinder diameter of 16 inches and a stroke of 24 instead of 22 inches.
A slightly larger axle spacing on the bogie made it possible to arrange the cylinders horizontally. In the beginning, the fireboxes of the locomotives contained a smoke consuming device of the type designed by D.K. Clark that blew fresh air directly over the fire. In addition to the removal of the smoke consumers, further conversions were carried out, which ensured a long service life. They remained in service until after 1923 and became class D47/2 of the LNER.
Technical data
General
- Built
- 1861, 1863
- Manufacturers
- Robert Stephenson & Co.
- Wheel arrangement
- 4-4-0 (American)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Service mass
- 35.1 t
- Adhesion mass
- 15.7 t
- Axle load
- 7.9 t
Boiler
- Grate area
- 0.952 m²
- Firebox surface
- 6.262 m²
- Tube heating surface
- 83.427 m²
- Evaporative heating surface
- 89.689 m²
- Total heating surface
- 89.7 m²
Power plant
- Driver diameter
- 1,549 mm
- Boiler pressure
- 9.7 bar
- Expansion type
- simple expansion
- Cylinders
- two, 406 x 559 mm
Power
- Power source
- steam
- Estimated power
- 149 kW (203 PS)
- Starting effort
- 48.9 kN
Calculated values
- Factor of adhesion
- 1 : 3.16
- Optimal speed
- 19 km/h
- Power-to-weight ratio
- 4.3 kW/t
- Heating Surface Equivalent
- 121.0 m²
- Cylinder volume/HSE
- 1 : 1,198.12
- Adhesive weight/Total
- 1 : 2.23
- Tractive force/Heating surface
- 1 : 11.38
- Grate area/Heating surface
- 1 : 94.21
- Firebox/Tube surface
- 1 : 13.32
