Metro Line M4

Line 4, is the fourth line of the Budapest Metro. It opened on 28 March 2014.The first section, 7.4 km in length and consisting of ten stations, connects the southwestern Kelenföld vasútállomás located in Buda, and the eastern Keleti pályaudvar in Pest, under the River Danube. While three additional sections — one an eastern extension to Bosnyák tér, the second west to Virágpiac, and a third further east to Újpalota — have been planned, these remain unfunded by the Budapest city government and the European Union.Before Line 4 was built, only Line 2 served the Buda side of the river.