High Quality Content by WIKIPEDIA articles! Siemens C651 Cars form a type of rolling stock that can be found on the North South Line and East West Line of the Mass Rapid Transit system in Singapore, operated by SMRT Trains. A total of 114 cars were purchased and introduced from 1994 onwards. This is the only white (in other terms, unrefurbished) train that is used on the SMRT North South Line and the East West Line.