The railway network in Montenegro expanded during the period of Kingdom of Yugoslavia. In 1927, the Podgorica - Plavnica line () was opened, followed by Bileća - Nikšić line in 1938. At that time, the railway network of Montenegro measured 143 km in length, with narrow gauge as a most common standard. However, the railway network was not integrated, and , and were present, additionally complicating the network operations. Multimodal transport was used for freight transport between Bar and Podgorica, as goods were transported by rail from Bar to Virpazar, then ferried across the Skadar Lake to Plavnica, followed by rail transport to Podgorica once again. Thus, it is fair to say that railway network in Montenegro was underdeveloped and unorganized prior to World War II.