[2] The first plans for the second Budapest metro line were made in 1942, and the Council of Ministers authorised its construction in 1950.

[3] Line 2 was originally planned to connect two major railway stations, Keleti (Eastern) and Déli (Southern) pályaudvar.

[3] The eastern end of the line was extended to Örs vezér tere, instead of Népstadion.

The accident did not result in a fatality, but according to the prosecution, a total of twenty-one were injured, five of whom were classified as serious.

[6] M2 runs in an east–west direction through the city, and it was the first metro line to cross the River Danube and reach Buda (the western part of Budapest).