EAP vocabulary: Learning

Unknown Words

What can you work out about the meaning of change gauge from the following text?

The Civil Aviation Committee met the next day and challenged two parts of the draft agreement that the Americans had inserted: the right of civil aircraft to use the US-leased bases in the Caribbean and Atlantic, and the right of US airlines to "change gauge" in Britain, that is, switch to smaller aircraft for flights going on as part of the fifth freedom.

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