
The opening of Downtown Line 3 (DTL3) completes the third and final phase of the 42km Downtown MRT line that links the north-western and eastern housing estates to the old and new downtowns.
Arup started work on this phase in 2008, developing the alignment design for the entire 21km stretch. Subsequently in 2009, Arup was awarded full detailed design for five stations and 5km of twin tunnels.