Hello @Telmavasconcelos
We are a public forum where everyone can have a say. If someone shares their opinion that does not match yours, please still acknowlegde. We would like to have constructive discussions here, not foolish language. We are here as volunteers to help & explain in our spare time. We are grateful if you respect the community netiquette.
Supersaver tickets are indeed valid for a certain connection only. Passengers benefit from a low cost but must, in return, adhere to the itinerary as selected during ticket purchase. If bought with SBB (or the indepedent Rail Europe travel agency), there is a clear message on the condition.
This is how the Supersaver tickets work in our country. There is the official ticketing tariff T601.10 that defines their validity and conditions of use. The tariff is based on the public transportation law. Everything is legal.
To pay the difference between a Supersaver and a normal fare ticket is not an option given by the tariff. People with Supersaver tickets on the wrong train are considered passengers without a valid ticket.
As there is no access control at stations, anyone can access the platforms of a station and take any train calling the station. It remains the traveler’s own and sole responsibility to be on the right train and to have a valid ticket for it.
When I follow the discussion correctly, I assume that the error happend with RhB, the train company that operates trains from St. Moritz to Chur. Their train agent did not realise that the tickets were for a later train and accepted them, although the Supersaver rules are the same on their trains: people with Supersaver tickets on the wrong train are considered passengers without a valid ticket since they broke the rules.
The SBB conductor realised that your ticket was not valid for their train and they have charged two full fare tickets from Chur (not St. Moritz) to Zurich HB at CHF 42 each.
From this view point, the SBB conductor was rather lenient and only requested the cost for a new ticket from Chur, probably because they noticed you are tourist. However, to let you travel on the original ticket without any objection would not be fair towards those who use Supersaver tickets correctly, with all the strings attached. Indeed, if the SBB conductor had applied/enforced the penalty as requested by the tariff, the cost would have been, for 2 people, CHF 90+90+80+80, while 90 is the surcharge for travelling without a valid ticket per person. Consequently, the ticket conductor saved you a total of CHF 256. A fair amount, right?
Kind regards,
Roland