The 35.7-kilometre Circle MRT Line (CCL) is Singapore's fourth Mass Rapid Transit line, and the first medium capacity line. This underground line is long with 28 stations (excluding Bukit Brown) and is fully automatically operated. As the name implies, the line is an orbital line linking all radial lines leading to the city, and also covering many parts of the Central Area. It will also connect to Marina South via a spur line branching off from Promenade and ending at Marina Bay. Circle Line is not a full circle, and the Stage 6 will only merge the section from Marina Bay to HarbourFront. The line is colored yellow on the MRT Rail map.