Penang Hill Railway

The Penang Hill Railway is a one-section funicular railway which climbs the Penang Hill from Air Itam, on the outskirts of the city of George Town in the Malaysian state of Penang. The railway first opened in 1923 as a two-section railway, but was overhauled in 2010 into a one-section system. It is a single-track railway with a passing loop, and it passes through a tunnel which is the steepest in the world. The total journey time can take between five and twenty minutes. The funicular train coach travels directly from the lower station to the top, but may stop at other intermediate stations upon request.

Source: Wikipedia