• A flexible rail fastening superstructure will be constructed along the running tracks, with increased capability to attenuate noise and vibration near sensitive buildings.
• A glued rail fastening superstructure will be constructed on the operational tracks.
• In the depot clamp spring rail fastening system with concrete sleepers will be installed on surface tracks, while glued rail fastening superstructure will be provided in car sheds.

In addition, of course, a so called mass spring system with a good environment protection efficiency can also be applied. Finalisation and authorisation of superstructures will be completed following tender design phase, depending on the submitted tenders upon approval of the Transport Authority. Railway superstructure of 1435 mm gauge and welded continuous rails similar to the ones used for existing metro lines will be constructed in the tunnels.