SBS1688K was still spotted on 163 just 2 weeks ago. Was it a
recent deployment to replace those TRG MK3s?
Looks like SBS8150Z might be the replacement for SBS1688K. It
had been spotted on 163 last Sun, as well as these past 3 days.
SBS938X had been running around HGDEP ever since SBS9678L came
into 163/163M.
Just ytd I passed HG depot and saw this bus with double L plate
holders and today I passed again and confirmed my suspicion. It
might be a replacement for one of its mk IIIs, but then again all
the mk IIIs do get to go out on the roads.
Actually 1688K was a off peak TRG bus in hg depot because it
usually did trainings inside the depot on off-peak hours..morning
and afternoon since the beginning of this year.
938X might be a temp perm for sv163 till 9678L came in since it
cameoed on most of its services. Ytd it did one of the services at
HG int cant rmb what service was it.
Do look out for 9678L and 8150Z perm stix if you catch them one
day and see whether they have gotten it yet. 
