The aim of this deliverable is to identify the design requirements to develop new track concepts that address the general objectives of the project, i.e. an affordable, adaptable, automated, resilient and high capacity railway infrastructure. Those requirements comprise geometrical, mechanical, environmental, construction, maintenance, operational and safety features that the new track system should accomplish. When possible, the requirements have been differentiated between high-speed and mixed traffic, that are the two scenarios set out in the Description of Work. The starting point for the developments are the current track systems, that are broadly described in this report, and the regulatory framework, in particular the Technical Specifications for Interoperability (TSI). This will ensure that the new systems are competitive against existing track concepts and will ease the homologation and market implementation in every Member State. In order to feed the design with cutting-the-edge knowledge on railway infrastructure, three guidelines have been drafted: 1) Deeper knowledge on track actual loads; 2) Resilience to natural events; 3) Combined design to cost and RAMS methodologies. These reports, annexes to the deliverable, are able to be used by designers as stand-alone documents.