Hello @schweiz_zug_ika
In this case your friend was lucky and met a conductor who has shown a lot of goodwill. Why the conductor decided this way depends on the situation; we cannot further comment it. It is, however, a legal and therefore accepted solution.
Folllwowing the official process, according to the tariff, your friend would have had to pay a surcharge of at least CHF 90 plus the ticket.
Best regards,
Roland
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