trunk line
Noun
Meaning
(rail transport) A main railway line which usually forms the backbone of a rail network.
Coordinate term: mainline
The main line of a canal, from which other sections diverge.
A main telephone line.
Source: en.wiktionary.orgSynonyms
Hypernyms
Examples
A new train on a new line The new service, named Shinkansen (meaning new trunk line) would provide a new alignment, 25% wider standard gauge, continuously welded rails between Tokyo and Osaka using new rolling stock, designed for convert.
The trunk line consists of many fiber optic cables bundled together to increase the capacity.