Hello san
It is not possible to use your payment card for bookings on SBB.ch. We recommend that you use a different payment card or that you purchase your tickets at your nearest railway station ticket office.
We cannot determine the reason why your credit card was declined. It can happen that we reject credit card transactions for reasons of security. This action is primarily intended to protect the card holder.
If you received notice that your credit card was declined you must call your credit card company directly.
I wish you a nice afternoon.
Best regards
JulieL