Question: The Southern Railway runs from Vienna to Graz and the border with Slovenia at Spielfeld via the first mountain railway built in Europe to use what kind of track?
Sentence (from "Southern Railway (Austria)"): The Southern Railway (German: "Südbahn" ) is a railway in Austria that runs from Vienna to Graz and the border with Slovenia at Spielfeld via Semmering and Bruck an der Mur.
Relevant evidence: Yes