| box_width = auto
| name = Downtown MRT Line
Template:Lang | color = 79412A | logo = | logo_width = | image = MRT map DT.svg | image_width = 300px | caption = The Downtown Line is tentatively coloured brown, but change to blue. | type = Rapid transit | system = Mass Rapid Transit (Singapore) | status = Opened (Stage 1), Under Construction (Stage 2, 3) | locale = | start = Bukit Panjang (Stage 2) | end = Expo (Stage 3) | stations = 34 | routes = 1 | ridership = | open = | close = | owner = Land Transport Authority | operator = SBS Transit | character = | stock = Bombardier MOVIA C951 | linelength = Template:Km to mi | tracklength = | notrack = | gauge = Template:RailGauge | el = Third rail | speed = | elevation = | map = Template:MRT route | map_state = collapsed
The Eastern Region Line (ERL) will be the seventh Mass Rapid Transit line in Singapore and is currently under planning and evaluation. The construction schedule was announced in 2008 with completion set for 2020. Station locations are expected to be announced in 2012 or 2013.
The Eastern Region Line will, from Marina Bay, serve the residential estates of Tanjong Rhu, Marine Parade, Siglap, Bedok South and Upper East Coast, and link them to Changi in the east and interchange with the future Thomson Line. The line will be 21-km long and have 12 stations. This line follows closely to the southern stretch of the previously planned Eastern Region Line; instead of turning towards Expo, it goes eastwards and ends near Changi Point Ferry Terminal.
It is the fourth of four rail systems to be completed by 2020. The other three rail systems are the Circle MRT Line, the Downtown MRT Line, and the Thomson MRT Line. Together, the four will extend the rail network from the current 138 km of track to 278 km by 2020. When completed, these lines will improve movement in the city centre, with a train station within every 400m on average, roughly equating a five minute walk.
The Eastern Region Line was first officially announced on 18 October 2001. In its preliminary plans, Eastern Region Line was to have been a 40-kilometre rectangular loop that would complement the existing East-West Line and enhance inter- and intra-town travelling in the eastern region. It would have looped around the Jalan Besar and East Coast areas, intersecting the Circle Line and other lines along the way, benefitting residents in Tampines, Bedok, Marine Parade, MacPherson and Kaki Bukit.
However, the northern part of the loop such as Jalan Besar, Tampines, MacPherson and Kaki Bukit is now part of the Stage 3 of the Downtown Line. The most recent announcements, from 25 January 2008 have placed the new line for completion in 2020.