The Circle Line (CCL) is Singapore's fourth Mass Rapid Transit line. This underground line is 35.7 kilometres (22.2 mi) long with 30 stations (excluding Bukit Brown) and is fully automatically operated. It takes about one hour to travel from one end to the other. The line is coloured yellow in the rail map.As the name implies, the line is an orbital circle route linking all radial routes leading to the city. It also covers many parts of the Central Area.