I have the Saver Day Pass. Is this eligible for normal SBB train from Zurich to Chur and then the Glacier Express from Chur to Zermatt? I read in some of the discussion that for the Glacier Express, all I need is a valid ticket (which is my Saver Day Pass) and then book a reservation seat. Is this correct? Is the Glacier Express Train running on the 14th Dec 2024?