[1] : The Collaborative International Dictionary of English v.0.48

trolley \trol"ley\, trolly \trol"ly\, n.
   a a form of truck which can be tilted, for carrying
       railroad materials, or the like. eng.
   b a narrow cart that is pushed by hand or drawn by an
       animal. eng.
   c mach. a truck from which the load is suspended in some
       kinds of cranes.
   d electric railway a truck which travels along the fixed
       conductors, and forms a means of connection between them
       and a railway car.
   e a trolley car.
       1913 webster

[2] : WordNet (r) 2.0

trolley
     n : a wheeled vehicle that runs on rails and is propelled by
         electricity; "`tram' and `tramcar' are british terms"
         syn: streetcar, tram, tramcar, trolley car
see also:
streetcar tram tramcar trolley car 

Trolley >> T Words
Trolley, definition of term: Trolley
trolley_pag1.html

Trolley Wire >> T Words
Trolley Wire, definition of term: Trolley Wire
trolley+wire_pag1.html

Trolley Bus >> T Words
Trolley Bus, definition of term: Trolley Bus
trolley+bus_pag1.html