The Metro 4 (Officially: M4 South Buda–Rákospalota (DBR) Line Unofficially: Green Line) is the fourth or green line of Budapest Metro and opened on 28 March 2014.The first section 7.4 km in length and consisting of ten stations connects the southwestern Kelenföldi pályaudvar located in Buda and the eastern Keleti pályaudvar in Pest under the River Danube.
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