under Belgrade control. During the NATO bombings on FR Yugoslavia, a significant part of the railway and facilities on the Serbian railway network was destroyed or disabled. In 2004 Montenegrin Railways withdrew from the Union of Yugoslav Railways, the railway union officially ceased to exist with the entry into force of the new law on railways of the Republic of Serbia, which was passed in 2005. Upgrades During its existence, Yugoslav Railways upgraded a number of older lines and integrated many others. Following World War II, the railway line Nikšić-Podgorica was completed in 1948, with gauge. A single-track electrified line connecting Prešnica with Koper was built in 1967. In 1965, the Nikšić-Podgorica corridor was upgraded to standard gauge, thus standardizing the entire connection from Bar to Nikšić via Podgorica. The section from Nikšić to Bileća was decommissioned at the time, as well as the Gabela-Zelenika line. A large 760mm narrow-gauge rail network was constructed in the early 20th century, when the Kingdom of Dalmatia as well as Bosnia and Herzegovina were under Austrian control. The rail route to Dubrovnik went from Sarajevo via Mostar and Čapljina rather than to Split and Zagreb in Croatia. In 1967 the line from Sarajevo to Čapljina was upgraded to standard gauge, and from there extended not to Dubrovnik but to terminate at the nearby Port of Ploče, handling freight via Bosnia. The route from Čapljina to Dubrovnik was closed in 1975 by the Yugoslav Government, acting on the advice of foreign transport consultants. This was in spite of the attractive scenery of the route which has been compared to Switzerland's narrow gauge network. Proposals in 1985 to reopen the route were unsuccessful. Direct trains connected Zagreb with Ploče in thirteen hours, via Bosnia and Herzegovina. Today that connection is severed. Successor companies Željeznica Crne Gore (ŽCG) - Montenegro Hrvatske željeznice (HŽ) - Croatia Željeznice Federacije Bosne i Hercegovine (ŽFBiH) - Federation of Bosnia and Herzegovina, Bosnia and Herzegovina Željeznice Republike Srpske (ŽRS) - Republika Srpska, Bosnia and Herzegovina Makedonski Železnici (MŽ) - Macedonia Slovenske železnice (SŽ) - Slovenia Železnice Srbije (ŽS) - Serbia Hekurudhat e Kosovës - Kosovo Yugoslav Railwaymen's Day Yugoslav Railwaymen's Day on April 15 was established in 1950 to remember the work and sacrifice of railwaymen and women across Yugoslavia. It was founded on the 30th anniversary of the general railway strike of 1920, which began in the night of April