The City Loop is a piece of underground commuter rail infrastructure in the central business district (CBD) of Melbourne, Victoria, Australia
Platform at Melbourne Central station in the City Loop, August 2017
Melbourne Town Planning Commission's 1929 plan for a city rail tunnel, a precursor to the City Loop.
Construction of Museum station in July 1974, showing cut and cover excavation of La Trobe Street, with the State Library of Victoria in the background.
Construction of Museum station in July 1974 looking towards Coop's Shot Tower.
Rapid transit or mass rapid transit (MRT), also known as metro, is a type of high-capacity public transport that is generally built in urban areas. A rapid transit system that primarily or traditionally runs below the surface may be called a subway, tube, or underground. Unlike buses or trams, rapid transit systems are railways, usually electric, that operate on an exclusive right-of-way, which cannot be accessed by pedestrians or other vehicles. They are often grade-separated in tunnels or on elevated railways.
The London Underground is the world's first and oldest rapid transit system.
The New York City Subway is the world's largest single-operator rapid transit system by number of metro stations, at 472.
A crowded Paris Métro average station platform in 2007
A station of the Guangzhou Metro in 2005
