the mrt line joins central singapore to the western and eastern parts of the island, with another branch to changi airport from tanah merah. transferring to the north south line is done at jurong east, city hall and raffles place stations while transfer to the north east line at outram park station is possible using a linkway. for circle line at paya lebar station and buona vista using an underpass and linkway. the downtown line will interchange with the east west line at the bugis, tampines and expo mrt stations.