Do my FIP Coupons expire when I return to the issuing railway’s network?

The following rule generally applies:

After returning to the network or country of the issuing railway, tickets already used on railways neighbouring the issuing railway may not be used again. For the purposes of this provision, all Swiss FIP railways, i.e. SBB, BLS and SP, are considered one railway.

This rule only applies to FIP Coupons of railways that directly border the issuing railway’s network. Neighbouring operators can be found in the sidebar of the respective operator pages (or in the drawer on mobile).

Here’s an example: An employee of Deutsche Bahn wants to travel to Italy via Switzerland. They have FIP Coupons from SBB and Trenitalia. Upon returning to Germany, all unused fields on the SBB FIP Coupon are forfeited. However, the Trenitalia fields remain unaffected, as there is no border crossing between DB and Trenitalia.