"Tristan Miller" wrote in message
...
Greetings.

A friend of mine uses pay-as-you-go Oyster and regularly takes the
Overground from Kentish Town to Stratford, and then continues by
Underground from Stratford to Gants Hill. She claims that, while making
the intercharge, she has to touch in at a red Oyster card reader in
Stratford or else she gets overcharged for her journey. Is this true?

Yes, but only since last month. Previously certain journeys were deemed to
always be via zone 1, although it was possible to take a route without using
zone 1, using the NLL for example So they've listened to the criticism and
fixed it, by adding interchange validators, which allow pax to prove they
used the cheaper route.

If you use the Oyster single fares finder, it will have a 'cheaper
alternatives' option where one exists, that details the different routes.

Paul S