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wheel trolley

noun
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Definition of wheel trolley

: a grooved rotating wheel attached to the end of the trolley pole of an electric railway car or bus for making constant rolling contact with the trolley wire

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“Wheel trolley.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/wheel%20trolley. Accessed 6 Mar. 2021.

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