> Assuming you have to have at least one person working on the train anyway, for safety reasons if nothing else, having them also check tickets doesn't cost ext

> Assuming you have to have at least one person working on the train anyway, for safety reasons if nothing else, having them also check tickets doesn't cost extra. That’s actually wrong, regional trains (where this ticket applies) usually have only the Lokführer driving the train, but no additional staff. Checking tickets is done purely by patrols checking trains randomly.