When building began in August 2013, circulating trains were a rare sight on the layout. Yet, as the opening in May came ever closer, more and more passenger and freight trains appeared in more and more places.
The testing of the railway, the track and the workings started on the German layout, then continued on the Austrian and the Hungarian one. It was a great challenge to allow the trains to run while building was still ongoing in many places. The opening was preceded by 2 full weeks of testing.