[4] The single track tramway originally ran from the quayside, but some years ago it was cut back to start from a short, level, enclosed loading area.
In between it runs on slopes ranging from 1 in 14 (7.14 %) near the foot to 1 in 1.9 (52.6%) for the last 40 yards (37 m), giving a total rise of 173 feet (53 m), emerging near the castle's kitchens.
In 1951 the island was connected to the National Grid, since when the rope has been powered by a 12 horsepower (8.9 kW) AC motor.
At that time four or five runs were made in a typical day, with considerable increases if building work was taking place when, for example, granite blocks and 20-foot (6.1 m) scaffolding poles have been carried.
[12] The only part readily accessible to the public is the disused last few feet, ending at the harbourside wall,[13] in which a pair of wooden buffer stops is embedded.