The underground trolley is a safe substitute, but the great expense of installation renders it available for very few localities.
1823, in Suffolk dialect, "a cart," especially one with wheels flanged for running on a track (1858), probably from troll (v.) in the sense of "to roll." Sense transferred to "pulley to convey current to a streetcar motor" (1890), then "streetcar drawing power by a trolley" (1891).
A stupid person; a dullard
[1970s+ Army; probably fr the dwarf or demon of Norse mythology]