Great Northern (UK) No. 264 to 269
Great Northern (UK) Ivatt class B6
Great Britain 1866 6 produced
The last locomotives that Sturrock designed for the GNR were six 2-4-0 express locomotives with a driver diameter of seven feet. These were built half each by Fowler and the Yorkshire Engine Co. The steel driving wheels were an innovation. Since the coupling rods often broke, Stirling rebuilt the locomotives to the 2-2-2 wheel arrangement from 1873 onwards. In this form they were more successful and were only retired between 1898 and 1902.
Technical data
General
- Built
- 1866-1867
- Manufacturers
- John Fowler & Co., Yorkshire Engine Co.
- Wheel arrangement
- 2-4-0 (Porter)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Wheelbase
- 5.51 m
- Rigid wheelbase
- 5.51 m
- Water capacity
- 11,364 l
- Fuel capacity
- 2 t (coal)
Boiler
- Grate area
- 1.83 m²
- Firebox surface
- 11.241 m²
- Tube heating surface
- 84.263 m²
- Evaporative heating surface
- 95.504 m²
- Total heating surface
- 95.5 m²
Power plant
- Driver diameter
- 2,134 mm
- Boiler pressure
- 10.3 bar
- Expansion type
- simple expansion
- Cylinders
- two, 432 x 610 mm
Power
- Power source
- steam
- Estimated power
- 280 kW (381 PS)
- Starting effort
- 46.8 kN
Calculated values
- Optimal speed
- 37 km/h
- Heating Surface Equivalent
- 151.7 m²
- Cylinder volume/HSE
- 1 : 1,176.84
- Tractive force/Heating surface
- 1 : 10.24
- Grate area/Heating surface
- 1 : 52.19
- Firebox/Tube surface
- 1 : 7.50
