Upvote:2
If you wish to use the Deutsche Bahn to cross the border to Austria, you should check the Deutsche Bahn site for known train interruptions
Assume that this may change at any time.
Check eligibility to enter Austria
Sources:
Upvote:2
The official website of Deutsche Bahn lists the current interruptions due to corona (only in german, trying to change the language to english took me back to the main page):
https://www.bahn.de/p/view/service/aktuell/index.shtml
According to this site, several trains between Germany and Austria have been cancelled, including the NightJet, but I assume that other trains are still running. Since the site doesn't mention ICE trains between Germany and Austria, I assume they are still running.
In case the trains stop running before you make it to Austria: If you are eligible to enter Austria, nothing should stop you from entering by taxi (or, taking a taxi to the german side of the border, crossing the border by foot, ordering another taxi to pick you up at the austrian side of the border) - but depending on how close to the border you can get by train this can be quite expensive.
I wouldn't count on buses or coaches: They have never been quite as popular as trains, and the one company that offered (more or less) regular coach services - Flixbus - stopped operations tonight due to corona.