Oyster pre-pay balance display
Why is it that when I use my oyster to go through a tube station gate
sometimes the pre-pay balance is displayed and sometimes it isn't?
So far all my journeys have been within my season ticket zones so the
pre-pay balance hasn't changed yet, but it seems a matter of chance
whether or not the gate displays the balance, even at my "home"
station. Is there any logic to it?
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