A trolley pole; a single-pole device for collecting electrical current from an overhead electrical line, normally for a tram/streetcar or a trolleybus.
Gremlinesque behaviour might not be very obvious to an America, who would accept as perfectly natural the quaintly pixilated sayings and doings that are happening in subways, in trolleys, on buses, in bars at all times of the day and night.1946, George Johnston, Skyscrapers in the Mist, page 107:
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US, Colloquial A light rail, tramway, trolleybus or streetcar system.
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A truck from which the load is suspended in some kinds of cranes.
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A truck which travels along the fixed conductors in an electric railway, and forms a means of connection between them and a railway car.
About a shopping trolley, I thought I'd let ye know. Ya'd try to push it straight but it never seems ta go. Ya'd wobble through the car park, hopping off the cars. Anyone would think ya had a few auld jars.2013 March 15, “The Shopping Trolley” (track 10), in Horsing Around, performed by Richie Kavanagh:
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Abbreviation, Clipping Clipping of flatbed trolley.