The purpose of this European Standard is to specify rules and limits for track alignment design parameters, including alignments within switches and crossings. Several of these limits are functions of speed. Alternatively, for a given track alignment, it specifies rules and limits that determine permissible speed. This European Standard applies to nominal track gauges 1 435 mm and wider with speeds up to 360 km/h. Normative Annex A describes the conversion rules which shall be applied for tracks with nominal gauges wider than 1 435 mm. Normative Annex B is applied for nominal track gauges 1 520 mm, 1 524 mm and 1 668 mm. This European Standard is also applicable where track alignment takes into account vehicles that have been approved for high cant deficiencies (including tilting trains). More restrictive requirements of Technical specifications for interoperability relating to the ‘infrastructure’ subsystem of the rail system in the European Union (TSI INF) and other (national, company, etc.) rules will apply. This European Standard need not be applicable to lines, or dedicated parts of railway infrastructure that are not interoperable with railway vehicles tested and approved according to EN 14363.