There are other anomalies
I once went from Fenchurch Street (Zone 1) to Blackhorse Road (Zone 3), changing from C2C to the Overground at Barking . (Zone 4)
I had a Zones 1 - 3 travelcard loaded on to Oyster, as well as a non zero PAYG balance, and touched in at Fenchurch Street and out at Blackhorse Road as normal.
Yet nothing was deducted from the PAYG balance despite the fact that I travelled outside the zones on my travelcard.
Does the system assume a different route for this journey and if so what route?
Are there pink readers at Barking that you should touch in order to pay the additional fare, and if not what would happen if your ticket was checked
See Single Fare Finder. It says 'No fares were found for that journey'.
I am unsure what would happen to a PAYG user who did that -
possibly 2x maximum fares.
But for a Z1-3 Travelcard holder, there is no charge.
Providing you touch in/out at your origin & destination, and providing you have sufficient PAYG balance to cover any charges, you are travelling legitmately.
There are many journeys where you will not be charged and providing you are demonstrating a willingness to pay any charges, you are doing nothing wrong. It's up to the system to charge you when appropriate.
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Now that is interesting, because there is no fare defined from Fenchurch Street to Blackhorse Road I've often wondered what the Oyster would do in such situations. So it seems that in your case, because both the origin and the destination were within your season ticket's zones, it decided to do nothing. I wonder what it would have charged had you not had the travelcard, though.
I see you had the same thoughts as me
