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The Circle Line (CCL) is a medium-capacity Mass Rapid Transit line in Singapore operated by SMRT Corporation.
It runs in a currently incomplete loop from Dhoby Ghaut station in the city area of Singapore to HarbourFront station in the south via Bishan station in Central Singapore.
It also has a branch to Marina Bay station from Promenade station, which will be extended to Harbourfront station from 2026 to form a complete loop.
Coloured orange on the rail map, the fully-underground line is 35.5 kilometres (22.1 mi) long with 30 stations.
Travelling from one end of the line to the other takes about an hour.

The Metro Rail Transit Line 3, also known as the MRT Line 3, MRT-3 or Metrostar Express, is a light rapid transit system line of Metro Manila, Philippines.
Originally referred to as the Blue Line, MRT Line 3 was reclassified to be the Yellow Line in 2012.
The line runs in an orbital north to south route following the alignment of Epifanio de los Santos Avenue (EDSA).
Although it has some characteristics of light rail, such as the type of a tram-like rolling stock used, it is more akin to a rapid transit system owing to its total grade separation and high passenger throughput.

Peng Kang Hill MRT station is a future elevated Mass Rapid Transit (MRT) station on the Jurong Region line in Western Water Catchment, Singapore.