AJC question for AT-CH connection

[Watershed]

I'm thinking of using a combination of split tickets for an upcoming journey from Langen am Arlberg to Zurich, changing at Bregenz Riedenburg and St Margrethen (SG):

• VVV Maximo ticket, which I believe covers Langen to St Margrethen even though the latter involves crossing into Switzerland for the last few stops from Bregenz (the VVV Zonal map suggests so)
• An SBB Supersaver ticket from St Margethen to Zurich

Would I be entitled to take the next available train from St Margrethen if I miss my booked train due to delays, under the Agreement on Journey Continuation (AJC)?

The connection suggested in both the ÖBB and SBB journey planners is only 4 mins at Bregenz Riedenburg - which I imagine complies with the Minimum Connection time. But I'm wary of the fact that the 'right time' punctuality on the Arlberg line doesn't seem to be great. It doesn't help that I'll be on an ICE service for that leg (albeit it starts in Austria).

In terms of the procedure for taking the next train, what does that involve - do I need to get my Supersaver ticket endorsed? If so, where do I go for that - it looks like the St Margrethen ticket office will be shut when I'm going through there. I don't think Bregenz Riedenburg has one.

The train from Bregenz to St Margrethen is an S-Bahn service so likely won't have a conductor. I can get a printout from the ÖBB website to show the delay, but is that sufficient by itself?

Splitting "only" offers a relatively small saving of €15 or so compared to buying a through ticket - so I might just get that, in the knowledge that I'll get some delay compensation if I do miss the connection (whereas I'll get nothing with split tickets, AIUI).

 

[30907]

DB suggests going via Bregenz itself; the connection at St Margrethen is then tighter. Or catch the preceding RJX at 10.04?

 

[Watershed]

DB suggests going via Bregenz itself; the connection at St Margrethen is then tighter. Or catch the preceding RJX at 10.04?

Taking the earlier RJX is the most logical option - it would be helpful if the journey planner suggested that. I suppose it's an overtaken journey so it's filtered out by default unless you have specific a higher minimum connection time.

That said, I imagine most people would prefer more than a +4 connection, coming off a long distance service liable to delay on a busy single track line. I would trust such a connection in Switzerland, but in Austria...

That leaves the question of how to exercise AJC rights if the connection is still missed. Any experiences people have had in a ticket office-less and guard-less context would be useful.

A slight complication I've just thought of is that journey opportunities from St Margrethen to Zurich generally alternate between direct SBB services, and SÖB to St Gallen followed by SBB.

I know that ticketing in Switzerland is generally operator-agnostic, but does this mean that you would technically be limited to only SBB services if you miss the connection - and that AJC wouldn't apply if you're on an SÖB-SBB itinerary (since SÖB aren't party to the AJC)?

Perhaps I am overthinking it but it would be good to understand the detail of how this works!