Formerly known as Trans-Island Bus Services (TIBS), renamed as SMRT bus services after merger with Singapore Mass Rapid Transit Company in 2004. Singapore Mass Rapid Transit (SMRT) is the dominant operator of the subway system in Singapore, also known as the MRT. At the same time, SMRT also operates a fleet 800 buses serving between 5 major interchanges, and a fleet of 3000 taxis as well!