Sometimes its better to leave out some regos and place a
question mark next to it than to completely assume it as a perm bus
service. I was quite pissed off when u stated a lot of errors on
the yishun trunk service, esp 800, 804 and 806.
For that reason, i also have some reason to believe that u had
started to collect regos for quite some time, as the last time that
1232 and 1200 had appeared on 806 is at least 1 month ago, and 812,
816 and 575 at least stayed on 804 for at least the past 2 months.
It is very very rare to get a 12m on 806 nowadays due to the high
load........only 756 and 945 appeared last week on 806.
Moreover, there are no bendies perm on 804. Hence, i thought u are
falsifying info.
Given that TIBS currently have insufficient buses, it is very easy
to see if the bus is perm on the service........One does not need
to care about AM and PM shift...that is the driver's business. If
the shift is S, chances are that it is a "cameo". A perm bus on
TIBS is normally seen throughout the day, its just driven by
different drivers.
TQ shifts are not fixed from 8 to 8. For example, svc 806 drivers
can drive the bus the entire day from 0600 to 2200. Their shift
timetable is still AM/PM, only that the same driver change
timetables. 50% of 806 buses knock off after 8pm, but all go into
service at 0600 to meet the student demand.
As for myself, im sorry to say that i can't exchange regos and info
with you for past deployments, and i dun care to take down regos as
they are too much of a hassle. For that matter, my rego list comes
from experience, so its easier to spot cameos.
For example, the fleet in 1999-2000:
800: 816, 818 , both of which are ceded to 804 after it started to
operate bendies.; 970 which was the envy of many feeder
services.
804: 815, 495, now x-fer depot to WLDEP, and perm on svc 969; not
sure abt 815 though, but i dun see it in Yishun these days.
780 when NAC, was on 804, pending fitting of AC was transferred to
851, and also shares its time with 852. After conversion, it was on
851 and other AMKDEP svcs. Spotted it many times on 969.
806: 579, 746 ( 746 is x-fer to WLDEP, it still has the blue
traffic police ad, and is perm on 969. ) 579 has the trial bus-lane
camera, prob also x-fer depot.
812: One of the first to get bendies, esp the first to receive the
"citaros" 975 and 976. Now still in AMKDEP, 975 is prob on WL
already, and 976 is perm on 851, or whenever its lady driver is
deployed to.
Hope this may help 
784 also crossed over to 806 until 1999 when it was NAC from svc
804.