M101 railway (Croatia)  The state border–Savski Marof–Zagreb Glavni kolodvor railway (), officially designated as the M101 railway, is a railway line in Croatia, connecting the nation's capital Zagreb and its main railway station to the Slovene railway network west of Savski Marof and further on with Ljubljana. Its route follows the Sava Valley. It is an integral part of the Pan-European Corridor X running from Salzburg and Ljubljana towards Skopje and Thessaloniki. The railway connects to the M102 railway at its eastern terminus in Zagreb, linking Zagreb with railways extending north to Budapest and east to Belgrade. Furthermore, the railway connects to the M202 linking Rijeka, the R201 to Čakovec via Zabok and the L102 railway to Kumrovec. The L102 is largely unused, and only a short section extending to the village of Harmica is in use. The M405 railway, a short line branching off to the south between the Zagreb Zapadni railway station and Zagreb Glavni kolodvor. The M405 terminates at the Trešnjevka wye, where it connects to the M104 and M202 railways. The Savski Marof–Zagreb railway was opened in 1862 as part of a railway line from Zidani Most to Sisak, which was not only the first railway line to Zagreb but the first on the territory of Croatia at all. The second track was commissioned in 1944. It was the route of the Orient Express service from 1919 to 1977. It is electrified and double-tracked.