In 24 January 2014, the MTRC, now operating the West Rail Line on KCRC's behalf, ordered another 36 new cars (under contract number 1151) to convert the SP1900 sets on all three lines to 8-car configurations for the future East West Corridor.
A separate order was also made for 136 carriages from Changchun Railway Vehicles to form several new 8-car sets for the East West Corridor, operating alongside the SP1900 sets.