Definition of trunk line in English:
A main line of a railroad, telephone system, or other network.
- It was the junction of the main trunk line to New Plymouth, to Auckland and Wellington.
- Once we left the trunk line and entered an unpaved road, there were hardly any vehicles.
- This was the key trunk line between Philadelphia and Pittsburgh, which also linked those cities to larger rural markets.
Definition of trunk line in:
- British & World English dictionary