Gruezi!
I have FIP ID and also coupon for free rides in Austria and Slovenia.
Night train EN 40414 from Zurich to Zagreb is passing through the following countries: Switzerland -> Austria -> Slovenia -> Croatia.
I tried going to SBB office at both Zurich Oerlikon and HŽ office at Zagreb and no one was able to make a reservation for me for night ride from Zurich to Zagreb which uses these coupons.
The price of that option would be only half-price of ticket from Zurich HB to Buchs SG.
It would be great if you can help me to actually use these coupons because right now I can only pay half price of full ticket.