The Metro Monorail (formerly Sydney Monorail, and originally TNT Harbourlink) is a single-loop Von Roll MkIII monorail in the city of Sydney, Australia, that connects Darling Harbour, Chinatown and the Sydney central business and shopping districts. There are eight stations on 3.6 km of track, with four trains operating simultaneously. Major attractions and facilities such as the Powerhouse Museum, Sydney Aquarium and Sydney Convention and Exhibition Centre are served.