Proastiakós (Greek: Προαστιακός, meaning "Suburban") is the name used by the suburban railway system of Athens, Greece. It currently connects Athens Central Railway Station (Larissa Station) with Eleftherios Venizelos International Airport and Corinth. There are plans to extend the Proastiakos to Loutraki in the south, Thiva and Chalkida in the north and East Attica, as well as Piraeus and Elefsina. This new rail system is operated by OSE Organismós Sidirodrómon Elládas (Οργανισμός Σιδηροδρόμων Ελλάδας), the state railway organization.
Athens Central Railway Station - Eleftherios Venizelos International Airport
Corinth - Eleftherios Venizelos International Airport
Athens Central Railway Station - Corinth
Planned Lines and Stations (Future projects)
Segment: Piraeus - S.K.A. (planned improvement of the existing line)
Segment: S.K.A. - Athens International Airport "Eleftherios Venizelos" / Rafina / Lavrio) (new line)
Segment: S.K.A. - Corinth - Kiato / Loutraki) (new line)
Segment: S.K.A. - Halkida / Thiva (planned improvement of the existing line)
The route of the line was first marked out in 1994. In 1997, bridges were constructed. During the construction of the route 6 of the Attiki Odos in the late 1990s, space was left between the main carriageways for the Proastiakos line. After two years of construction, the Proastiakos stretch to Eleftherios Venizelos opened in 2004.
On 27 September 2005, the Proastiakos reached the city of Corinth. Apart from the new Proastiakos station in Corinth, four new stations became fully operational on the same day, namely: Nea Peramos, Megara, Kinetta and Agioi Theodoroi.
The Proastiakos is expected to reach Patras by 2010.