"TheOneKEA" wrote in message
om...

IMO if a station is evacuated for any reason, TfL have two ways to deal
with Oystercards:

1. Set up a booth with a battery-powered wireless validator and simply
have
everyone touch their card to erase the entry record, then let them go.
2. Do the same as above, but instead generate an exit record and charge
them
for their abortive journey.

Or option 3. Cancel all unresolved journeys on the central system for people
who could have been effected. Having had local staff make announcements that
you won't be charged.

Dave.