Transport infrastructure / Urban Railway


Underground routing of existing double-track railway corridor in the centre of Athens, Greece


Location: Greece
Client: OSE S.A. (Greek Railways Organization)
Date: 2015 – 2016
Construction costs: approx. € 40 million
Technical Details

The project involves the underground routing of the existing railway line in the centre of Athens for a total length of 1.84 km and the underground routing of a major road axis, Retsina Street, in Piraeus. Both interventions belong to an improvement of the railway/city interface and enhancing safety cogitations by eliminating numerous at-grade road and pedestrian crossings in densely populated areas of the city. The railway line has two tracks and a maximum Design Speed of Ve = 60km/h.

The Design process comprises four stages:

  • Preliminary Design
  • Master Design
  • Detailed Design
  • Tender Documents

OBERMEYER’s assignment embraces the provision of engineering services in both the design and the tender phase.

The project includes 1 station, 2 Pedestrian bridges, 1 Cut &Cover and 1 road underpass. To keep the railway line in operation during the construction works, special measures were designed to ensure the ongoing operation. In addition, extensive landscaping is foreseen for the project, add open-air spaces with enhanced greenery in a densely built industrial and residential area in the city centre.

The project adheres to the EU interoperability requirements and designs are according to European regulations. The project is funded by the European Transport Network.

Services Provided

The scope of services includes the execution of surveys, the elaboration of all designs for civil works and the elaboration of the tender documents for the procurement of works.


  • Geodetic (topographical) surveys
  • Geotechnical Surveys


  • Detailed design for all Civil Works (substructure, superstructure, structures)
    • Alignment – substructure
    • Railway superstructure
    • Cut & Cover
    • Railway station
    • Pedestrian bridges
    • Underpass
    • Retaining walls
  • Architectural Design of station and pedestrian Bridges
  • Landscape Design for all free spaces above the underground railway route
  • Expropriations
  • Environmental Design

Tender Documents:

  • Technical part (arising from the approved designs)
  • Legal part: Invitation, General and Special Conditions of Contract

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