Trolley

google

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early 19th century: of dialect origin, perhaps from troll2.

wiktionary

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Early 19th century (1823) meaning "cart", of dialectal origin (Suffolk), probably from troll(“to trundle, roll”) +‎ -ey(diminutive ending).

etymonline

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trolley (n.)

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 "device used to transmit electric current to streetcars, consisting of a trolley wheel which makes contact with the overhead wires" (1888), then "streetcar drawing power by a trolley" (1891), which probably is short for trolley-car, attested from 1889.