trunk line

Noun
  1. Line that is the main route on a railway (synset 104499559)
    is a type of: line, rail line, railway line - the road consisting of railroad track and roadbed
    same as: trunk route
  2. A telephone line connecting two exchanges directly (synset 104499452)
    is a type of: line, phone line, subscriber line, telephone circuit, telephone line - a telephone connection

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