That was what I've been seeing for some time too even though
3860R keeps appearing on Sv 518 as well. Either they shuffled the
slots such that one of the perm Citaros is now supposedly perm for
518A, and 3860R is on that Citaro's former slot, or 3860R is
replacing another bus entirely (for whatever reason it is).
I do think 518A should get upgraded to one DD slot eventually
though. The crowds from Pasir Ris in the morning do justify
that..and I don't know how they can persist with Citaros in the
long-term on 518A without getting any complaints from frequent
commuters.
IMO, either the first or second 518 leaving Pasir Ris Int after
the last 518A needs the DD, as majority of the time, office pax
can't board a SD due to it being full from TP students from Ave 2
to TP. Also, it seems like there are demand at Bedok North also.
Unfortunately, the demand, IMO is, for unlikely reasons, higher
than 518A.
Unless they change the other DD timing.
