NEN EN 13803-2 : 2007 + 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
  6.1 General
  6.2 Principle based on limiting values of abrupt change
      of cant deficiency ([delta]I)
7 Circular curves without transition curves
  7.1 Limiting values based on the principle of abrupt change
      of cant deficiency [delta]I[lim]
      7.1.1 General
      7.1.2 Switch and crossing layouts
      7.1.3 Plain line
  7.2 Limiting values based on the principle of the virtual
      transition
  7.3 Minimum radius of horizontal curves
8 Combinations of horizontal curves
  8.1 General
  8.2 Limiting length of intermediate element(s) between two
      abrupt changes of curvature (L[slim])
  8.3 Abrupt change of cant deficiency ([delta]I) at abrupt
      changes in curvature in combined curves
      8.3.1 Length of intermediate element(s) equal to, or
            greater than the limiting minimum value
            (L[s] >= L[slim])
      8.3.2 Intermediate element(s)of sub-standard length
            (L[s] < L[slim]) or no intermediate
            element (L[s] = 0)
  8.4 Requirements for preventing buffer locking
9 Alignment rules and parameters for designing switch and
  crossing layouts
  9.1 General rules
      9.1.1 Horizontal alignment
      9.1.2 Vertical alignment
  9.2 Switch and crossing layouts in straight track without
      cant
      9.2.1 Simple turnout
      9.2.2 Turnouts with variable curvature
  9.3 Switch and crossing layouts installed on horizontal
      curves
      9.3.1 General rules
      9.3.2 Horizontal radii
      9.3.3 Cant D
      9.3.4 Cant deficiency I
      9.3.5 Cant excess E
Annex A (informative) General design considerations
Annex B (informative) The installation of switch and crossing
        layouts
      B.1 Standard switch and crossing units
      B.2 Lateral track resistance at the switch panel
      B.3 Stress transition zone between continuously welded
           track and jointed track
      B.4 Switch and crossing layouts on, or near under-bridges
      B.5 Limits for diamond crossings, diamond crossings with
           slips and tandem turnouts
      B.6 Switch and crossing layouts with steel bearers
      B.7 Abutting turnouts
      B.8 Crossovers and follow-on turnouts with reverse curves
      B.9 Scissors crossovers and single or double junctions
      B.10 Tracks with cant gradients
      B.11 Influence of cant on the deflection angle in the
           horizontal plane
Annex C (normative) Rules for converting parameter values for
        track gauges wider than 1435 mm
      C.1 Scope
      C.2 Symbols and abbreviations
      C.3 Basic hypothesis
      C.4 Conversion rules
          C.4.1 Application of [delta]I limiting values
          C.4.2 Cant
          C.4.3 Equilibrium cant
          C.4.4 Other formulas and values of the standard
          C.4.5 Annexes
Annex D (informative) Limits of lateral acceleration
      D.1 Introduction
      D.2 Wheel-base effect
      D.3 Limiting values of the non-compensated lateral
          acceleration
      D.4 Conclusion
Annex E (informative) The principle of virtual transition
      E.1 Virtual transition at an abrupt change of curvature
      E.2 Virtual transition at a short intermediate length
          between two abrupt changes of curvature
      E.3 Limiting values based on the principle of the
          virtual transition
          E.3.1 General
          E.3.2 Characteristic vehicle with a distance of
                20 m between bogie centres
          E.3.3 Characteristic vehicle with a distance of
                12,2 m and 10,06 m between bogie centres
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
      H.1 General
      H.2 The maximum permissible speeds over abrupt changes of
          curvature
      H.3 The permissible speeds over switch and crossing
          layouts on curves
Annex ZA (informative) Relationship between this European
         Standard and the Essential Requirements of EU Directive
         96/48/EC of 23 July 1996 on the interoperability of the
         trans-European high-speed rail system amended by the EU
         Directive 2004/50/EC of 29 April 2004
Bibliography

Defines the maximum operating speeds over tracks with abrupt changes in curvature and, consequently, abrupt changes of cant deficiency.