EN 13803-2:2006+A1:2009

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 General requirements
6 Principles for the assessment of abrupt changes of cant
  deficiency at abrupt changes in curvature
7 Circular curves without transition curves
8 Combinations of horizontal curves
9 Alignment rules and parameters for designing switch and
  crossing layouts
Annex A (informative) - General design considerations
Annex B (informative) - The installation of switch and crossing
                        layouts
Annex C (normative) - Rules for converting parameter values for
                      track gauges wider than 1435 mm
Annex D (informative) - Limits of lateral acceleration
Annex E (informative) - The principle of virtual transition
Annex F (informative) - A method for calculating the maximum
                        permissible speed at the toe of a
                        non-tangential switch
Annex G (informative) - Constraints and risks associated with
                        the use of maximum (or minimum) limiting
                        values
Annex H (informative) - The maximum permissible speed of tilting
                        body trains over switch and crossing layouts
Annex ZA (informative) - Relationship between this European
                         Standard and the Essential Requirements
                         of EU Directive 2008/57/EC
Bibliography

This European Standard specifies the rules and values for the track alignment design parameters used to determine the maximum operating speeds over tracks with abrupt changes in curvature and, consequently, abrupt changes of cant deficiency. Such conditions occur in the following situations:-in the diverging tracks in switch and crossing layouts;-when it is not practical to design an alignment with transition curves;-if the length of a transition curve is less than the minimum required for plain line track.Engineering requirements specific to the mechanical behaviour of switch and crossing components and subsystems are to be found in the relevant standards.This European Standard presupposes that the homologation of the operating vehicles will be valid and specified for conditions corresponding to the limiting values specified in this European Standard.This European Standard is applicable to abrupt changes in curvature in switch and crossing layouts and plain lines with track gauges of ˜1 435™ mm and wider. Annex C is applicable to track gauges wider than ˜1 435™ mm.This European Standard specifies the requirements for preventing buffer locking.The limiting values specified in this European Standard, when applied at the switch toe, are for switches with tangential geometry (as defined in EN 13232-1).This European Standard need not be applicable to certain urban and suburban lines.This European Standard is not applicable to track alignment requirements for tilting body vehicles. However, Annex H draws the designer’s attention to the consequences and the restrictions imposed when tilting vehicles are operated over switch and crossing layouts and alignments without transition curves.