be built to serve the new Terminal 5. Other local rail lines Singapore has had other various forms of light railway systems, such as the monorail system on Sentosa island, which opened in February 1982. This 6.4 km, 6-station system was closed in March 2005 and a new Sentosa Express system was built by December 2006. The Jurong BirdPark previously featured an air-conditioned panorail which closed in 2012. A two-feet gauge railway using diesel-powered "steam locomotives" had also previously operated at the Singapore Zoo in the mid-1990s. Historically Singapore had also operated several industrial railways at the Port of Singapore and the Mandai Quarry and several military railways at military bases at Admiralty and Changi. International rail links KTM West Coast railway line The sole mainline railway line providing direct international connections is the Malaysian West Coast railway line which runs across the Johor–Singapore Causeway from Johor Bahru to Woodlands Train Checkpoint, the southern terminus of the line. The metre-gauge single track previously ran all the way to the Tanjong Pagar railway station in southern Singapore, running through Kranji, Bukit Timah and Buona Vista. The line was however closed on 30 June 2011 and train services, which were provided by Keretapi Tanah Melayu, ended at Woodlands instead. The railway tracks were progressively removed. All KTM Intercity train services used to cross the Causeway and end at Woodlands. However, from 1 July 2015, a shuttle service began running between Johor Bahru Sentral railway station (JB Sentral) in Johor Bahru and Woodlands. Intercity train services formerly serving Woodlands Train Checkpoint terminated at JB Sentral. The shuttle service will be replaced by the Johor Bahru–Singapore Rapid Transit System by 2027 when it is expected to become operational. The Eastern and Oriental Express luxury train runs between Woodlands and Bangkok via Kuala Lumpur. Johor Bahru-Singapore Rapid Transit System The idea of an MRT link across the border to Johor Bahru has been mooted since the first MRT line was built in the 1980s. In 2010 when the relocation of the KTM terminus to Woodlands was agreed, it was also announced that a rapid transit system would be built to enhance connectivity across the border and to relieve congestion on the Johor-Singapore Causeway. The RTS is currently envisioned as a two-station line. Singapore RTS terminus will be at Woodlands North, providing interchange with the Thomson-East Coast MRT Line. The Johor Bahru RTS terminus will be