Run by Metoline, which is fully owned by ComfortDelgro. Which is
direct opposite of our Sv 190 here, use big bus run by someone
else. :P
For no particular reason, I decided to go to the Transport for
London web site to see what their route 190 is like, and it seems
like it's an opposite of our route 190 too, short and mostly
serving residential areas, unlike our city-bound and long route
190. That explains the small buses for this route, though it can't
explain why SBS Transit's cousin in London is running
it 
.
p.s. Slightly off-topic, but I find the Transport for London web
site to be really well-designed and comprehensive; they have
service updates for both their bus and rail systems, etc., and
their journey planner even has an option for cyclists! Definitely
something for LTA to learn from and emulate, rather than wasting
taxpayers' money on rather useless gimmicks like the next bus
arrival boards, who functionality, to be honest, is rather
limited.
