The barcode issue has been looked at, many different implementations floating around at the moment. There is a need for on train scanners and gates, costly.
It works well if you enforce booking ahead when its pretty clear that your name is on the manifest and as an SNCB conductor told me, right ticket in the right seat on the right train, no need to resort to scanner. Thats how the airline work it, fixed passenger lists and tight access control.
UK applications have been very very restricted, Heathrow Express, Chiltern, Virgin WC is only Manchester London. Its within a franchise not network wide
Long term smartcard technology is likely to be the solution to finally replace the good old magstrip ticket which works
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