Loop line

Isolated Circles

 * Sengkang LRT - opened in 2003, 14 stations, 10.7km
 * Punggol LRT - opened in 2005, 15 stations, 10.3km

Shared Circles

 * Bukit Panjang LRT - 7.8km, 13 stations, opened in 1999

Spirals
This rare and unusual type of loop can help rail lines to climb steep geographical inclinations. The one that is not inclining spiral will be the Downtown Line, where a spiral of 8 stations is located in the city centre.
 * Singapore - Downtown Line (6.5km), all meeting at the Rochor junction - the Downtown spiral consisting of Bugis, Promenade, Bayfront, Downtown, Telok Ayer, Chinatown, Fort Canning, Bencoolen and Sungei Road.

Rings Under Construction

 * Singapore - Circle Line (37.3km), 30 stations - opened in 2009, to be completed by 2025.