Outerchange

//ˌaʊ.tə(ɹ)ˈtʃeɪndʒ// noun

Definitions

Noun
  1. 1
    A connection between two stations within walking distance of each other but which are not physically connected; used especially where a journey involving such a connection can be done on a single ticket. British, London

    "The five minute walk between Northwick Park and Kenton tube stations is a valid outerchange."

Etymology

From outer + change by analogy with interchange.

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