'Trolley line' definitions:

Definition of 'trolley line'

(from WordNet)
noun
A transit line using streetcars or trolley buses

Definition of 'Trolley line'

From: GCIDE
  • Trolley car \Trol"ley car\ (Elec.) A motor car powered by electricity drawn from a trolley, and thus constrained to follow the trolley lines. [Webster 1913 Suppl. +PJC]
  • Trolley line, (a) A trolley (f) . (b) The path along which a trolley car runs. [PJC]