There is no shuttle train from CCK to BBT.
So, for northbound direction, there got 2 destinations:
1. Marina Bay to Choa Chu Kang
2. Marina Bay to Bukit Batok
Alternate I think: CCL, BBT, CCK, BBT and CCK & so
on....
Reason: Limit the number of trains travelling from CCK to
BBT
But Don't know why I saw 049/050 resting at Platform B BBT
station with door close...
Nope its this method
Trains terminating at CCK will terminate at CCK (Of course) and
then proceed to Bukit gombak as DNB. Then wait for the train ahead
to clear the crossover then go to Bukit Batok in CM.
Trains terminating at BBT will just go to BBT as normal.
RM to Crossover. P3/P4 at crossover, damn violent. Then at bukit
gombak onwards. Normal all the way.