In railways, the most important specification is that of rail gauge, the distance between the inner surfaces of the heads of the travel rails.Both track and wheel bogies must be built to the same gauge; unless the two fit together within a typical tolerance of 13 mm (0.5 in) on the track, the train will either fall off the track or it will be impossible to go through switches or crossovers.

However, there is a small tolerance; for example, the Hong Kong MTR ) gauge rails (but not vice versa), with a locomotive or a KCR EMU pulling due to different electrification voltages.

Another example would be Finno-Russian border: when in the Seventies the Soviet Union redefined the breadth of a Russian gauge from the traditional five feet (1524 mm) to exactly 1520 mm, the Finnish railways stuck with the old value.

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The school still remembers this with a plaque in the central area, a junction of corridors known as 'Piccadilly'.

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