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add definition of WT
*'''PT''' indicates a ‘pannier tank’ engine, having a tank hung on each side of the boiler but clear of the frames. This arrangement was used most commonly, though not exclusively, by the GWR.
*'''ST''' indicates a ‘Saddle tank’ engine, having a single tank slung over the boiler like a saddle.
*'''WT''' indicates a 'Well tank' engine, having the water tank between the frames, under the boiler.
Thus ‘Flying Scotsman’ would be described as a 4-6-2 (a tender engine with 2 leading wheels, 6 coupled driving wheels and 2 trailing wheels), while ‘Thomas the tank engine’ is correctly described as 0-6-0T (6 coupled driving wheels, no leading or trailing wheels, and side tanks).
