Athens Metro

Hill International is providing technical consultancy services to Elliniko Metro S.A. for current and future metro and tramway projects in the Attica Region. Hill provides expert technical input to support Elliniko Metro at every stage of project execution, from design through procurement, construction, testing, and commissioning.

One of the major projects Hill supports is the Line 4, Section A project. Section A, a U-shaped segment running from Alsos Veikou through the city center to Goudi, spans approximately 12.8 kilometers and includes a tunnel linking Line 4 with Lines 2 and 3, as well as an access tunnel to the train stabling and maintenance yard at Katehaki. The project, with a budget exceeding €1.5 billion, encompasses the construction of 15 underground stations and 9 intermediate and/or terminal shafts. With connections to the city center and other key locations throughout Athens, the project will enhance regional mobility with a sustainable, affordable, and convenient transit option.

Line 4 Section A’s main underground tunnel will feature double-tracked rail and an internal diameter of approximately 8.5 meters and an external diameter of approximately 9.5 meters. The project team is excavating the tunnels by using state-of-the-art earth pressure balance tunnel boring machines (EPB-TBMs) to overcome the anticipated geological, hydrogeological, and geotechnical challenges.

The new segment will include innovative features that distinguish it from other underground metro systems of similar scale. To overcome the challenges posed by limited above-ground space, the project includes underground stabling sheds, maintenance tracks, a new operations control center in the existing Sepolia Depot, and a new emergency control center. The system will also feature 20 fully automated 4-car trains capable of operating without drivers or attendants. The implementation of advanced communications-based train control technology will enable an operational headway of 90 seconds. Additionally, the system will include a variety of energy-saving features, such as the recovery of energy generated during train braking, which will be fed back into the city’s high-voltage network if not utilized by other accelerating trains.

Hill has also supported the commissioning and close-out phases of the Line 3 extension to Piraeus, the Athens Tram extension projects, the production of tender designs and specifications for the extension of Line 2, and the procurement of a new series of rolling stock.

Photo Credit: ELLINIKO METRO S.A. (Photographer S. Spyridonos)

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