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
Siege of Budapest the old town. The Red Army, after a much-needed pause in hostilities, resumed its offensive on 19 December. On 26 December, a road linking Budapest to Vienna was seized by Soviet troops, thereby completing the encirclement. The Nazi-supported "Leader of the Nation" ("Nemzetvezető"), Ferenc Szálasi, had already fled from the city on 9 December. As a result of the Soviet link-up, nearly 33,000 German and 37,000 Hungarian soldiers, as well as over 800,000 civilians, became trapped within the city. Refusing to authorize a withdrawal, Adolf Hitler had declared Budapest a fortress city ("Festung Budapest"), which was to be defended to