Metro Line M4 (Budapest Metro) Metro Line M4 (Budapest Metro) Line 4 (officially: South Buda–Rákospalota (DBR) Line, Metro 4 or M4, and unofficially: Green Line), 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
Greater Budapest Greater Budapest Greater Budapest is the name of Budapest in its present, extended size, as it was created by the "Law No. XXVI of 1949" passed on December 15, 1949 and it came into force on January 1, 1950. By attaching 7 towns and 16 villages to the former Budapest, its area enlarged from 207 km² to 525 km² (154%), the number of its inhabitants increased from 1.05 million to 1.6 million (52%), and the number of the districts augmented from 14 to 22 (57%), thus becoming the seventh metropolis of Europe in its time. The only difference between the