We're quickly running up against a situation here.
Caltrain has said that we should switch from paper monthly passes to Clipper monthly passes starting in October.
A 2+ zone CalTrain monthly pass gives you local fare credit on VTA busses and light rail. I use this every once in a while to take the #60 bus home from the Santa Clara CalTrain station.
VTA does not yet take Clipper. VTA has yet to issue any statement of any kind as to when they might. There are Clipper terminals installed on every VTA bus I have ridden on this year, so far as I can remember, but they're covered over by plastic "out of order" bags.
I'd be happy if VTA would just come out and say when they expect to remedy this situation.