The Collaborative International Dictionary
Aerial railway \A*["e]`ri*al rail"way`\
A stretched wire or rope elevated above the ground and forming a way along which a trolley may travel, for conveying a load suspended from the trolley.
An elevated cableway.
Wiktionary
n. A system involving an enclosed carriage suspended on a series of wires, usually attached to a steep mountain slope, used for personal transportation over normally untraversable territory.
Usage examples of "aerial railway".
Now, while bold but less wholly intrepid hands chipped footholds along the line of the first rope and beyond, began one of the most elaborate cat's cradles that Jack had ever seen: although it was nothing to the aerial railway of the Diamond Rock, it was the bosun's seventh heaven, and presently all was ready to send a nine-pounder cannon up, sliding along a steep messenger to a point where it commanded the lagoon: and if a nine-pounder would not answer, then two fourteen-pounders could not possibly be denied.