The trains manufactured by a consortium led by Kawasaki Heavy Industries (KHI) under Contract 151 (C151), sometimes abbreviated to KHI C151 are the first generation electric multiple unit rolling stock in operation on the North South and East West Lines of Singapore's Mass Rapid Transit (MRT) system. These are the oldest trains built for the system. They were introduced in 1987 and are still in operation. Sixty-six trainsets consisting of six cars each and a single money train set consisting of four cars were purchased. These trains are operated by SMRT Trains. To date, there are 63 of these trains currently operating on the East West Line, with occasional appearances on the North South Line.