outerchange

outer +‎ change by analogy with interchange

• (UK) IPA^(key): /ˌaʊ.tə(ɹ)ˈtʃeɪndʒ/

outerchange (plural outerchanges)

1. (Britain, chiefly London, rail transport) 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.

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

• interchange

• encourageth