In message . com,
" writes
Not every Londoner as a underground near them so they use a Overground
which don't take Oyster card pay as you go so we don't save on the cost
of one-day travel with a Oyster card pay as you go,we have to use Cash
fares.
So much for the Oyster Revolution in London


You can get Oystercards at newsagents, so if the Overground used them it
would not be a problem.
--
martyn dawe