Choa Chu Kang MRT/LRT station
The MRT station opened on 10 March 1990 and was the terminus of the Branch Line. Construction began on 15 February 1986. With the opening of the North South Line Woodlands Extension on 10 February 1996, the branch line became part of the North South Line. It was recoded from B3 to N21 in 1996. The LRT station opened on 6 November 1999, on the opening day of the Bukit Panjang LRT line. It was again, recoded from N21 and A1 to the present BP1 and NS4 in 2001.