n. [ Probably fr. roll. ] A small wagon used for the underground work of a mine. Tomlison. [ 1913 Webster ]
. (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 heavy conducting wire on which the trolley car runs and from which it receives the current. [ Webster 1913 Suppl. ]