I want to buy a train ticket from Geneva to Innsbruck. There is a super-saver option - however, it says no exchange or refund possible. Is it possible to use a supersaver ticket for any of the journeys that day - I am not sure if I will be getting the 1:30pm or 3:30pm train. If I buy a ticket for the 1:30pm train, will my ticket still be valid if I am late and get the 3:30pm train instead?