till now we have 3 full day NAC Scanias on 32 which is a
20% chance of boarding one during peak hours and 23% after peak
hours. ive seen so many tourists boarding it and their feedback.
lets jus say it isnt positive. going thru North Bridge and
Funan area and river valley. areas where quite a number
of prestigious hotels are sited and in the heart of town
too.
Still recalled that time in 1998 when service 138 was also
downgraded from FAC to PAC, though it was a tourist based route
from AMK MRT to Singapore Zoo (but became FAC again in
2000). Remembered seeing some "ang mor" tourists on board the
NAC Merc 0405 buses.
Anyway now still got chance for tourists to enjoy NAC bus
journeys to Bird Park, take 251 from Boon Lay MRT 
It also seems like service 32 is one of the few bus services
left to have NAC buses that goes to CBD areas (other
than 125 and 186).