I will be visiting Switzerland shortly with a One Country Switzerland Interrail pass.
On Monday 16th October EC163 Zurich to Graz is diverted via Bregenz due to construction work.
The journey planner indicates the train stops at St. Margrethen SG to pick up passengers.
If I purchase a St. Margrethen SG to Bregenz ticket to supplement the Interrail would I be permitted to travel on this train?
The journey planner indicates this train is likely to be less busy than the Zurich to Munich trains with no need to change.