Legally the setup is correct, either way it has no impact on the system. Keeping the ticket means very little, since the ticket won't allow you enter or exit again
I've had no problems with normal booking office issued tickets, unlimited tickets eg monthly are always faster on entry (no need to print on rear) but no different on exit to singles/returns
The question becomes what happens if the machine fills up with used tickets what does it do, shut down for exit or simply not retain the ticket ?
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