The whole of the main lines to be electrified were being equipped with four-aspect colour-light signals, automatically operated, where appropriate, and spaced to give a 5min headway throughout.

Sixty minutes divided by the headway gives a potential figure for 'trains per hour' - the simplest possible and most simplistic definition of capacity, termed line capacity.

So as not to impede navigation the two principal spans of the bridge were designed to provide a clear headway of 157 ft. above high water for a distance of 500 ft.; ….

Headway

Meaning

Noun

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