It runs 40.2 kilometres (25.0 mi) from a junction with the Southern railway line at Graz Hauptbahnhof to Köflach.

Graz-Köflacher Bahn und Busbetrieb [de] (GKB) owns and operates the line.

[2] The line opened for goods traffic on 3 April 1860; passenger service began on 1 November.

[1] Graz-Köflacher Bahn und Busbetrieb [de] (GKB) operates two services of the Styria S-Bahn over the line.

The S7 operates hourly, with additional service on weekdays, over the entire line between Graz and Köflach.