Commission decision of 20/XII/2007 concerning the technical specification of interoperability relating to "safety in railway tunnels" in the trans-European conventional and high-speed rail system. C(2007) 6450 final. Directive 2001/16/EC - Interoperability of the transeuropean conventional rail system. directive 96/48/EC on the interoperability of the trans-european high speed rail system. draft Techniocal specification for interoperability. Subsystems : "infrastructure", "energy", operations and traffic management", "control-command and signalling", "rolling stock". Aspect : "safety in railway tunnels"