Stealth OSIs
I got a bit of a surprise this morning when an Oyster Refund
Confirmation popped up in my inbox. Looking at my journey history, it
appears that there's an OSI between Sydenham and Crystal Palace
stations, with a time limit of at least 25 minutes.
This one doesn't seem to be on any of the lists that I can find. I
wonder how many more secret OSIs there are out there?
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