Line A2 is a remnant of a standard gauge suburban railway service that ran between Athens Airport and Kiato.

The first section of the service between the Airport and Corinth, using Class 560 diesel multiple units, opened on 27 September 2005:[3] the western extension to Kiato followed on 9 July 2007.

[4] Direct train services between Ano Liosia (the current western terminus of Line A2) and the Airport began on 18 July 2006, with the opening of Ano Liosia station on the Airport–Patras railway.

[6][7] On 30 July 2017, due to the restructuring of suburban railway services associated with the introduction of electric trains to Athens railway station and (since 2018) Piraeus, the direct Airport–Kiato service was replaced by the SKA–Airport shuttle, effectively reinforcing the median strip section of Line A1.

[9] Line A2 is an hourly service that runs between Ano Liosia and Athens Airport, along the median strip of the A6 and A64 motorways: additional rush hour trains terminate at Paiania–Kantza instead of the Airport.