Definition of trunk line in US English:

trunk line


  • A main line of a railroad, telephone system, or other network.

    • ‘Mexico has no trunk line from the U.S. border to Mexico City, rail line.’
    • ‘It was the junction of the main trunk line to New Plymouth, to Auckland and Wellington.’
    • ‘This was the key trunk line between Philadelphia and Pittsburgh, which also linked those cities to larger rural markets.’
    • ‘Brave members of the audience are sitting in freight cars that look as if they are about to head off down the main trunk line at any moment.’
    • ‘Once we left the trunk line and entered an unpaved road, there were hardly any vehicles.’


trunk line

/ˈtrəNGk ˌlīn/