trolley

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trolley:

see streetcarstreetcar,
small, self-propelled railroad car, similar to the type used in rapid-transit systems, that operates on tracks running through city streets and is used to carry passengers.
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trolley

[′träl·ē]
(geology)
A basin-shaped depression in strata. Also known as lum.
(mechanical engineering)
A wheeled car running on an overhead track, rail, or ropeway.
An electric streetcar.

trolley

1. Brit (in a hospital) a bed mounted on casters and used for moving patients who are unconscious, immobilized, etc.
2. a device that collects the current from an overhead wire (trolley wire), third rail, etc., to drive the motor of an electric vehicle
3. a pulley or truck that travels along an overhead wire in order to support a suspended load
4. Chiefly Brit a low truck running on rails, used in factories, mines, etc., and on railways