GWR 5700 Class - Other Pannier Tank Locomotives

Other Pannier Tank Locomotives

There were numerous other classes of pannier tanks built by the GWR. They fundamentally belonged to only two "families" of "large" and "small" designs, excluding some absorbed stock and even a few conversions of tender locos. The two groups were:-

• "Large" group originally featuring saddle tanks (or in a few cases side tanks), 4'6" driving wheels and double frames e.g. 1076 Class or inside frames GWR 645 Class, culminating in the 94xx
• "Small" group originally built at Wolverhampton Works with saddle tanks and driving wheels of 4 ft commencing with the GWR 850 Class and culminating in the BR 16xx

For example within the "small" group, the GWR 5400 Class locomotives were derived from the William Dean -designed GWR 2021 Class (an enlargement of the 850 Class), with larger wheels for higher top speed and fitted with autotrain apparatus ('auto-fitted') for push-pull passenger work. The GWR 6400 Class were similar to the 5400 Class, also being auto-fitted, but having the same size wheels as the 5700. The GWR 7400 Class were very similar to the 6400 Class, but were not auto-fitted and had a higher boiler pressure.

Within the "large" group, the GWR 9400 Class was the post-war updated design of the 8750 variant of the 57xx: heavier and longer, but nominally no more powerful, using the same taper boiler as the GWR 2251 Class.

For a list of classes, see GWR 0-6-0PT.