Meaning of “main line” in the English Dictionary

british dictionary

"main line" in British English

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main linenoun [ C ]

uk /ˌmeɪn ˈlaɪn/ us /ˌmeɪn ˈlaɪn/

an important railway route between large towns or cities:

the main line between New York and Philadelphia

(Definition of “main line” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)