Singapore’s MRT (mass rapid transit) system is probably the fastest way to zip around the city. The extensive rail network means that most of Singapore’s key attractions are within walking distance from an MRT station. ... They are also available at the Automated STP Kiosks. The Mass Rapid Transit, or MRT, is a rapid transit system forming the major component of the railway system in Singapore, spanning most of the city-state. The earliest section of the MRT, between Toa Payoh and Yio Chu Kang, opened on 7 November 1987.