Line A3 is an Athens Suburban Railway (Proastiakos) line in Athens, Greece, managed by Hellenic Train.

The line was inaugurated on 30 July 2017, using 17 OSE Class 560 DMUs, however, the line now exclusively uses OSE class 460 EMUs rolling stock.

The Athens–Chalcis train service, which forms part of Line A3 today, became part of the Athens Suburban Railway timetable on 10 February 2014, initially using existing diesel multiple units.

[4] Electric train services using Class 460 electric multiple units were introduced on 30 July 2017, when the electrification of the Piraeus–Platy railway between Agioi Anargyroi and Athens was complete.

[5] The spelling of the station names on this table, in English and Greek, are according to the signage.