Paul Terry wrote:

They're clearly capable of learning, but it's not made obvious that
there is anything to learn in the first place. It certainly *appears*
to work the same way as the tube - slap your wallet on the yellow thing
and usually the barriers open (but at other times you need to do it
several times) just like at tube stations.

Except that the majority of NR stations don't have barriers.

Nor do the bulk of DLR stations but you touch out on a stand alone machine.

It may be more useful to think in terms of what happens with paper
tickets. Your Zones 1-2 travelcard will appear to work fine for a journey
from Waterloo to Mortlake - it will let you in at Waterloo and there are
no barriers at Mortlake to prevent you leaving the system. But if you
haven't learned that you need to buy an extension ticket to travel beyond
Zone 2 you risk a Penalty Fare if gripped beyond Zone 2.

Yes but with travelcard seasons on Oyster one has never needed an extension
ticket. Someone with a zones 2-4 could enter at Stratford and leave at
Liverpool Street with a straightforward extension deducted. Nothing has said
that has changed. The publicity says that PAYG has been extended to all
national rail services in the zone, so why should they assume a Stratford to
Romford journey will be any different? Or for that matter why should the
Liverpool Street bound passenger be expected to know anything at all has
changed?