The project concerns:(a) In the study of the necessary work for the renovation and upgrading of the existing double railway line between the exit from the Acharnon Railway Centre (SKA) up to Oinoi Railway Station, a total length of 52 km which is part of the main railway axis Athens – Thessaloniki.b) In the study of the underpass of vehicles and pedestrian crossing at the Railway Station Aliartou.c) The technical services are provided for the technical assistance for the documentation of the necessity.