[ruszki]

I travel between Vienna and Budapest quite frequently, and ÖBB (Austrian railway) does also this deliberately on Austrian side towards Vienna. Trains can arrive about 15-20 minutes early in Vienna if they go full speed in Austria, and they arrive in time to the Hungarian border. This rarely happens, and in that case, they go slower.

Also, there is almost always delay between Budapest and a smaller Hungarian city. ÖBB changed schedule for their own trains quite quickly reflecting that. MÁV (Hungarian railway) still hasn’t done that for almost two years now on the same line. They still basically lie about it.