Paul Corfield wrote:

On this basis I have a RATP Mobilis card (their version of a ODTC but
you have a ID card), a Singapore EZ Pass, Hong Kong Octopus and Tokyo
Suica. I've had magnetic Metrocards in Hong Kong and paper "seasons"
in other cities. I cannot claim to know all the ins and outs of these
fare systems but I do what most people will do and that is search the
web and do a bit of research beforehand.

Is that what "most people" do? Really? Have you got any surveys to
back you up on this?

I know I've never looked up how to pay for the local public transport
before taking a trip somewhere. Check whether there is any public
transport nearby, yes. But nothing more. And I know people who don't
even do that much.

While I suppose I might be deemed an "expert user" here in London I
can't be said to be that in these other places. I cannot recall ever
being wrongly charged nor have I been caught out by the system other
than a couple of times in Paris.

Compare that with how often London's Oyster goes wrong, and it's
obvious that TfL must be doing something wrong somewhere.