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Funnily enough, there was actually a briefing about the subject of this thread early in December, but the fact is that it was still buried in an email attachment in the list of all the other emails, with the relevant information being several pages into it, and not accessible on the tablets which are used for ticket sales. Ticket offices are simply more likely to know on the grounds that they are local, and that literally is the main focus of their job - even an OBS, who is mainly there for customer service, has other things on their mind and will also constantly switch between areas of the country.
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Are you able to share what the briefing said?