I saw the C151A last friday at Yishun MRT station. But it ended
service at that station before turning back and continuing service
towards Marina bay. The run number is 212, didn't see the train
number. Maybe they are not allowed to run the whole NSL yet.
If u take later than 4pm onwards, some trains coming out from
Marina Bay will terminate at Yishun.. This is call short working
trip. Or SWT in short.