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*'''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 4 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).
Certain common configurations acquired names, those most relevant to the SVR being:
Thus ‘Flying Scotsman’ would normally be referred to as an example of a Gresley Pacific, rather than a Gresley 4-6-2.
Small diesel and petrol engine locomotives may be described using the same system. This may be followed by D for diesel or P for petrol, and another letter describing the transmission: E for electric, H hydraulic, M mechanical. Thus 0-6-0DM denotes a six-wheel diesel locomotive with mechanical transmission. For large diesel locomotives the [[UIC classification]] is used. UIC classification can also be used to describe steam locomotives, although in the UK Whyte notation has prevailed apart from the brief use of a modified version of UIC classification by the Southern Railway described [[UIC classification | here]].
