Under the agreement, the two sides agreed to work together towards the construction of a second track on the 15.6km line between Maribor and the border station of Spielfeld-Strass.

The €192m project is due to be completed in 2021 and will increase capacity on this section of the Ljubljana - Graz - Vienna corridor from 63 to 84 trains per day while reducing the journey time for the 63km between Maribor and Graz from 1h 10min to around 45 minutes.
Upgrading of the Spielfeld-Strass - Graz line has already been completed.