Definition of "branch line" []

• A secondary railroad route or one subsidiary to a railroad's main lines. (noun)

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• "Aldeburgh ” or as it came to be more commonly spelled in modern times, Aldborough ” is to-day a pleasant and quiet watering-place on the coast of Suffolk, only a few miles from Saxmundham, with which it is connected by a branch line of the Great Eastern Railway."
• "It was extended to Old Harbour in 1867, and from there to Porus in 1885, as well as the branch line to Ewarton from Spanish Town in the same year."