The Sydney Monorail (originally TNT Harbourlink and later Metro Monorail) was a single-loop monorail in Sydney central business and shopping districts. It opended in July 1988 and closed in June 2013

There were eight stations on the 3.6 kilometre loop, with up to four trains operating simultaneously. it served major attractions and facilities such as the Powerhouse Museum, Sydney Aquarium and Sydney Convetion and Exhibition Centre. The system was operated by Veolia.  [Source: http://goo.gl/Qq5HSA]