Bumper cars or dodgems are the generic names for a type of flat amusement ride consisting of multiple small electrically powered cars which draw power from the floor or ceiling, and which are turned on and off remotely by an operator. They are also known as bumping cars, dodging cars and dashing cars. The first patent for them was filed in 1921.
Bumper cars
Bumper cars in Kerava, Finland, powered by pole-mounted contact shoes that supply power from a conductive ceiling
Bumper cars at a state fair in Raleigh, North Carolina, 1940
A current collector is a device used in trolleybuses, trams, electric locomotives and EMUs to carry electric power (current) from overhead lines, electric third rails, or ground-level power supplies to the electrical equipment of the vehicles. Those for overhead wires are roof-mounted devices, those for rails are mounted on the bogies.
Trolley pole wheel on top of the trolley pole of Twin City Rapid Transit Company No. 1300
Modern one-arm "pantograph" collector with double collector shoes
Trolleybuses with trolley-type current collectors, i.e. trolley poles on trolley wires
A bow collector on a small electric locomotive