Cable car (railway)

A cable car or cable railway is a mass transit system using rail cars that are propelled by a continuously moving cable running at a constant speed. Individual cars stop and start by releasing and gripping this cable as required. Cable cars are sometimes confused with funiculars, where the cars are permanently attached to the cable.

Operation

The cable is itself powered by a stationary motor or engine situated in a cable house or power house. The speed at which it moves is relatively constant, although somewhat influenced by the current load.

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The cable car begins moving when a clamping device, called a grip, is connected to the moving cable. Conversely the car is stopped by detaching it from the cable, and then applying brakes. This gripping and ungripping action may be manual, as was the case in all early cable car systems, or automatic, as is the case in some recent cable operated people mover type systems. Gripping must be an even and gradual process in order to avoid bringing the car to cable speed too quickly and unacceptably jarring the passengers.

Related Topics:
People mover - Passenger

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In the case of manual systems, the grip resembles a very large pair of pliers, and considerable strength and skill are required to operate the car. As many early cable car operators discovered the hard way, if the grip is not applied properly, it might damage the cable, or even worse, become entangled in the cable. In the latter case, the cable car may not be able to stop and can wreak havoc along its route until the cable house realizes what is going on and halts the movement of the cable.

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One claimed advantage of the cable car is its relative energy efficiency, because of the economy of centrally located power stations, and the ability for cars going down hill to transfer energy to cars going up. However this advantage is not unique to cable cars, as electric cars fitted with regenerative braking offer the same advantages, and in any case they must be offset against the cost of moving the cable.

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