Trunk line
Ballentine's Law Dictionary · James A. Ballentine · 1916
Ballentine's Law Dictionary
A commercial railway whose main line connects towns, cities, counties or other points within the state or in different states, and has the legal capacity of constructing, purchasing and operating branch lines or feeders connecting with its main stem or trunk.
See 117 Ky. 146, 111 Am. St. Rep. 230, 4 Ann. Cas. 445, 63 L. R. A. 637, 77 S. W. 674.