A form of elevated monorail where the vehicle is suspended from a fixed track (as opposed to a cable used in aerial tramways.)They were the brainchild of Henry Robinson Palmer (1795-1844). The first suspended railway was opened at Cheshunt on June 25, 1825 using Palmer's patent. It was built to carry bricks, but as an opening stunt it carried passengers.

Reference
http://en.wikipedia.org/wiki/Suspension_railway

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