I.out [美 aʊt, 英 aʊt]副out often appears as the second element of certain verb structures in English (come out, keep out, knock out, etc). For translations, see the relevant verb entry (come, keep, knock, etc).
Although it approximately followed the line of the earlier railway, it was more heavily engineered with embankments, cuttings and tunnels, which tended to straighten out the earlier somewhat meandering course.