"Mizter T" wrote in message
oups.com
Kev wrote:

What zones does a prepay Oyster card cover?

Kevin


Er, all the London zones. But I think there may be some confusion
here.
snip

*Very important point*
Oyster Pre-Pay is not valid on National Rail (i.e. overground trains)
apart from a few exceptions [1]. This is set to change but not for
another couple of years at least.

I wonder if Oyster can be used on Thameslink (aka FCC) between Wimbledon
and Farringdon? It's obviously allowed on the Tube between the same
stations, and the same Oyster card readers/barriers apply regardless of
which train is taken, so the system won't know which route was followed.
But would a ticket inspector on the FCC train regard it as a non-valid
fare?