The Downtown Line (DTL) is a medium-capacity Mass Rapid Transit (MRT) line in Singapore. It runs from Bukit Panjang station in the north-west of the country towards Expo station in the east via a loop around the city-centre. Coloured blue on the rail map, the line serves 35 stations, all of which are underground. The DTL is the fifth MRT line on the network to be opened and the third line to be entirely underground. It is the second MRT line to be operated by ComfortDelGro's SBS Transit after the North East Line. It also serves as an alternative to the East–West Line where it runs roughly geographically parallel from Bugis to Expo station.