North Eastern class O
London & North Eastern class G5
The North Eastern Railway class O was designed by Wilson Worsdell to supplant the 2-4-2T suburban tanks of his brother Thomas. Between 1894 and 1901, 110 were completed at Darlington. They now had the 0-4-4T wheel arrangement and a higher tractive effort than their predecessors with a symmetric wheel arrangement. Although they had no leading axle, they were good for 60 mph between stations with a longer distance.
In 1923, they became LNER class G5. In the following decades they got no major rebuilds, but all survived until the founding of British Railways in 1948. The first one was withdrawn in 1949, but larger numbers only followed in 1955. By 1958, all were gone and scrapped. At Shildon, the Class G5 Locomotive Company Ltd. is now building a replica that will be numbered 1759.
Technical data
General
- Built
- 1894-1901
- Manufacturers
- Darlington
- Wheel arrangement
- 0-4-4T (Forney)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Wheelbase
- 6.86 m
- Service mass
- 56.8 t
- Adhesion mass
- 30.5 t
- Rigid wheelbase
- 2.36 m
- Axle load
- 17.6 t
- Water capacity
- 9,093 l
- Fuel capacity
- 3.6 t (coal)
Boiler
- Grate area
- 1.449 m²
- Firebox surface
- 9.105 m²
- Tube heating surface
- 92.439 m²
- Evaporative heating surface
- 101.543 m²
- Total heating surface
- 101.5 m²
Power plant
- Driver diameter
- 1,556 mm
- Boiler pressure
- 11 bar
- Expansion type
- simple expansion
- Cylinders
- two, 457 x 610 mm
Power
- Power source
- steam
- Estimated power
- 391 kW (532 PS)
- Starting effort
- 76.8 kN
Calculated values
- Factor of adhesion
- 1 : 3.89
- Optimal speed
- 31 km/h
- Power-to-weight ratio
- 6.9 kW/t
- Heating Surface Equivalent
- 147.1 m²
- Cylinder volume/HSE
- 1 : 1,360.99
- Adhesive weight/Total
- 1 : 1.86
- Tractive force/Heating surface
- 1 : 15.80
- Grate area/Heating surface
- 1 : 70.08
- Firebox/Tube surface
- 1 : 10.15
