Answer: trunkline

AnswerCrossword Clue
TRUNKLINEPhones in Fords?
TRUNKLINEMain communication channel
TRUNKLINERailroad artery, e.g.
TRUNKLINEPart of a railroad system.
TRUNKLINEMain railway route.
TRUNKLINESwitchboard connection