Definition of trollies:
(n) :
(US) A streetcar or light train.
(n) :
(US, colloquial) A light rail, tramway, trolleybus or streetcar system.
(n) :
(Australia, New Zealand, British, Ireland) A cart or shopping cart; a shopping trolley.
(n) :
(British) A hand truck.
(n) :
A trolley pole; a single-pole device for collecting electrical current from an overhead electrical line, normally for a tram/streetcar or a trolleybus.
(n) :
A truck which travels along the fixed conductors in an electric railway, and forms a means of connection between them and a railway car.