LT tube ticket gates
In article , Colum Mylod
writes
Is it not possible to "eject" the failed person (as it were) before
allowing a ticket to be inserted after a rejected one?
The first design of gate involved you walking through the gate while it
processed your ticket. At the end, you were either released with your
ticket or dumped into a "sin-bin" for an inspector to come over and
investigate.
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