M1 is the oldest line of the Bucharest Metro, the first section having been opened on 16 November 1979. The M1 Line runs from Dristor 2 to Pantelimon. Between Nicolae Grigorescu and Eroilor it shares 8.67 km (5.39 mi) of tracks with the M3. Due to the single track between Republica and Pantelimon, which has only one operational platform, most trains terminate at Republica and about one in three reaches at Pantelimon.