The bulletin I received this morning states, " Serbian and Hungarian railways report that international rail traffic is currently operating on schedule."
I can't find anything in the news that says that Austria has reconsidered their stopping the trains from Budapest on the 10th. I did see a 2 hour old news story describing how the train service between Austria and Germany had been suspended. This all is changing so fast that no one will know what is going on until they get to the station.
Just received notice that one of our guests that was arriving in Budapest from Vienna had their train canceled this morning. Not sure if they had a plan B
https://community.ricksteves.com/travel-forum/austria/vienna-current-refugee-situation
We left Vienna's main HBF train station today. Many refugees. Delays
and lines. Don't make our mistake -- buy tickets in advance. The OBB
agent told me I could buy them with the app (not on website) and then
show my phone on the train but I had already waited in line. Train to
Prague was full but space available on a later train. I believe the
tickets would have been less $ if I used Czech rail website instead of
buying with OBB in person.
Our guests made it on the next train.