Anyway,
SBS2629A
(BN 33) 
(BN SP)
This one is more or less confirmed. I've been seeing this bus run
around since Nov last year. This past week it did Sv 81, 518, and
some more. Today on Sv 8. And the days I spotted it cameoing, are
usually on weekdays. This should
solve the extra BN 33 bus that "service_238" mentioned the other
time after the timetable revision last year.
I know "Rui jing" suggested 2600G might be out of Sv 33 as well,
and I think that's possible. But I always considered 2629A to be
the one out from Sv 33 first, cause 2600G only started cameoing
around Dec.
Think one of the SP KUBs is
actually stuck on Sv 33 instead, not the initial 3 SP Citaros
(6249, 6254, 6272) for now. Someone please go and observe the Sv 33
fleet yeah, thanks. 
