 In places the line's speed limit has been raised from to , and plans have been made to raise this further to on certain sections.The railway line of the Pan-European Corridor Vb, from the Hungarian border via Koprivnica, Zagreb, Karlovac to the Port of Rijeka (lines M201, M102 and M202) has a slow section through Gorski Kotar, which is planned to undergo a major overhaul.The railway line of the Pan-European Corridor Vc, from the Hungarian border via Beli Manastir, Osijek, Đakovo or Vinkovci, Slavonski Šamac, to the border of Bosnia and Herzegovina (lines M301, M302 and M303), is also being modernised, the aim is to allow speeds of up to 160 km/h along the entire length.