Sep 6, 2019 - 2:56 PM
This forum is for tourists visiting Switzerland, not Austria.
You need to book trains through ÖBB, Austria’s national railway system www.oebb.at/en/ or through The Trainline website.
We regularly visit Austria and I have looked at the timetables from Salzburg to the places you mention. They are a long way away from Salzburg, the closest is 2.5 hours and the furthest away is about 4 hours by train. There are infrequent trains during the night and I am sure your host will not want to make the journey to collect you from any of the stations in the early hours of the morning.
It will be a very long day. The train journey from St Gallen to Salzburg takes approximately 7 hours. I suggest you stay overnight in Salzburg and make the journey to Wörschach the next day. Salzburg is a lovely city, my favourite city in Austria. We find the Austrian trains almost as reliable as the Swiss trains.
Hope this is of help.