(Hypothetical, no incident in the background.)
There are numerous reports from people who were unable to present a railcard, but say they did have one, in date. Physical card forgotten or digital card not working for some reason.
It may take up to six months for the TOC to follow up. They may be willing (once a year) to accept retrospective presentation of that railcard. In the meantime, the railcard may have expired (could be a matter of days). A physical railcard could be retained, showing the original validity dates. What of a digital railcard - once it has expired, is there any evidence it ever existed ?
There are numerous reports from people who were unable to present a railcard, but say they did have one, in date. Physical card forgotten or digital card not working for some reason.
It may take up to six months for the TOC to follow up. They may be willing (once a year) to accept retrospective presentation of that railcard. In the meantime, the railcard may have expired (could be a matter of days). A physical railcard could be retained, showing the original validity dates. What of a digital railcard - once it has expired, is there any evidence it ever existed ?