Its very important to note that no matter what type of ticket it is the stripe is rewritten every time it goes through
Now practical tests will show bank cards can take quite a lot of punishment in terms of magnetic sources, I've put through some very very badly damaged ones on a counter swipe and they worked, there is of course a long list of tricks to it
Best advice is to where possible use the newer turnstiles with the black top they seem to be less damaging
I got a monthly ticket swallowed at Dockland on opening day, got it back still works fine.
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