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 "Semmering railway"): The Semmering railway (German: "Semmeringbahn" ) in Austria, which starts at Gloggnitz and leads over the Semmering to Mürzzuschlag was the first mountain railway in Europe built with a standard gauge track.
Relevant evidence: Yes