Bucharest Metro Line M4
M4 is one of the five lines of the Bucharest Metro. It is currently long and runs from Gara de Nord to Străulești, following the Griviței and Bucureștii Noi avenues. History. Construction of the line started in September 1989, shortly before the Romanian Revolution. The tunnels were built up to where Parc Bazilescu is today. Construction was abandoned afterwards and was resumed later on in the 90's. The first section of the M4 opened on 1 March 2000 from Gara de Nord to 1 Mai. After many years of delays the next section to Parc  Bazilescu was finally opened on 1 July 2011. Parc Bazilescu was not in the initial plan and was only built to open the section quicker. In 2013, construction started on the final section of the M4 to Străulești, along with Străulești depot. On 3 September 2015 tunneling work was completed. The service was extended with two more stations, Laminorului and Străulești, which opened on 31 March 2017. Rolling stock. Despite being one of the newest lines on the network, the M4 runs old Astra IVA trains.