The contents: ¿ An introduction to the European Train Control System (ETCS) ¿ A description of how ETCS works and the levels at which it may be employed ¿ An exploration of the sub-systems, processes and interfaces ¿ The requirements for system testing, commissioning and certification ¿ Engineering - the technical, organisational and operational requirements ¿ The needs for maintenance, fault-finding and safety monitoring