The Hyundai Rotem EMU (also known as R-Train or 1141B) (Chinese: 港鐵東鐵綫現代列車) is a current model of heavy rail electric multiple units used on the Mass Transit Railway in Hong Kong. The 9-car sets are manufactured by Hyundai Rotem for the future North South Corridor, an extension of the East Rail line, at a cost of HK$4 billion. 37 trainsets were ordered in December 2012 and the first delivery took place in 2015, while a further 6 trains were ordered in May 2020. Originally scheduled to enter service in late-2017 to early-2018, the trains will gradually enter service from 6 February 2021. All train sets are expected to put into service by 2022, by which time all Metro Cammell EMUs will be retired and SP1900 EMUs will be withdrawn and reassigned to the Tuen Ma line.