Updated on 7 October.
For SMRT Buses:
TIB488J - Only MB O405 (OAC) with Konvekta aircon.
TIB572Z - Only public omnibus to be fitted with Alux rims.
TIB612S - Only MB O405 (OAC) with 2 extra foldable seats.
TIB700X - Only DAF to have a modified Hispano front.
TIB792E - Only MB O405 (CAC) to have new non-sliding windows.
TIB801M - The first bus in Singapore to be fitted with EZ-link
readers for trial.
TIB813D - Only MB O405 (OAC) to
have OC500LEs' announcement system.
TIB838H - First
bendy in Singapore.
TIB840A - The first and only ELBO (as of 6 October) to be
refurbished.
TIB890E - The only public omnibus in Singapore to have headrests
for the seats.
TIB905Y - The only bus in SMRT's fleet to have the original Volgren
front.
TIB958U - Only Volgren rigid fitted with LAWO
EDS.
TIB1010Y - Only Dennis Lance (Duple Metsec UK)
to have the new LAWO - Sicma EDS.
TIB1017D - F1RST
Dennis Lance to be bodied by Volgren.
TIB1018B - 2ECOND and last Dennis Lance to be bodied by
Volgren.
TIB1034D - The only Habit bendy to have Hanover EDS.
TIB1038T - The 100th bendy in Singapore and SMRT's fleet and only
Habit bendy fitted with LED tail-lights.
TIB1105H - The first bendy to be revived after a freak fire.
The only Habit bendy to have new PVC seats and Konvekta
aircon.
TIB1113 J - Only Habit bendy fitted with "BUS STOPPING" sign for
doors closing.
TIB1257C - Only Dennis Lance in ex-CSS fleet; CSS310U.
SMB1H - The F1RST Euro V bus in S.E.A..
The F1RST
bus in SMRT's fleet to have the prefix "SMB".
SMB135E - The F1RST China-made public omnibus in Singapore
(Currently in non-user layout status, as of 6 October).
SMB136C - The F1RST full low-floor bus in S.E.A..
For SBS Transit:
SBS8000Z/SBS8001X - The first
hybrid public omnibus.
SBS997A - The longest rigid
in Singapore, has three axles, measuring 14.5m in length (Superlong
bus).
SBS998Y - SBS's 1st articulated bus. Asia's
longest articulated bus, measuring 19m in
length.
SBS999U - SBS's 2nd
artuculated bus.
RD6066L (Research &
Development) (Higer) - The first fuel cell public
omnibus.
SBS7500D - The first double
decker in Singapore to be bodied with the famous Wright Eclipse
Gemini 2.
SBS8030L - First Volvo B7RLE
for SBST featuring the first bus in Singapore to use the new
generation Vogelsitze seats and wrap around rear
seats.
SBS8033D - First Scania K230UB in Singapore and the only one with
purple interior.
SBS8031J - First WAB MAN 16.240 HOCL demo for
SBST.
SBS7888K - First Scania K280UB (WAB)
bodied with the first prototype of Gemilang double
decker.
SBS9168S - The last Leyand to be
produced under Leyland name in the
world.
SBS9889U - The
only Volvo Super Olympian the has EDS and bodied by ComfortDelGro
Engineering.
Feel free to add on. :D
Info from myself, users in buses.sgforums.com, SBS Transit
(Wikipedia), SMRT Buses
(Wikipedia), and (bus[IN]gapore!)
blog.
Text in RED means
that the bus does not exist anymore.
