I catch most people mis-using the outward part of SOR's by the rule...
It is little known and very effective.
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Most stations with barriers retain them already. As for expenses, that is what a reciept is for.
For compensation, staff should be provided at gatelines to ensure tickets are clearly endorsed and allow those the holders to exit.
The outward part of an Anytime Return ticket is only valid for travel when accompanied by an unused return part of the same ticket.
It is little known and very effective.
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But that would be a major inconvenience for passengers who need their used tickets for claiming expenses or compensation for delay.
Most stations with barriers retain them already. As for expenses, that is what a reciept is for.
For compensation, staff should be provided at gatelines to ensure tickets are clearly endorsed and allow those the holders to exit.