prEN 13232-2 rev

Railway applications - Track - Switches and crossings for Vignole rails - Part 2: Requirements for geometric design

The same as for EN 13232-2:2003+A1:2011.

Bahnanwendungen - Oberbau - Weichen und Kreuzungen für Vignolschienen - Teil 2: Anforderungen an den geometrischen Entwurf

Der vorliegende Teil dieser Europäischen Norm umfasst folgende Themenbereiche:
-   die Beschreibung des Konstruktionsprozesses von Weichen und Kreuzungen sowie die Anwendung der anderen Teile dieser Norm;
-   die geometrischen Konstruktionsgrundsätze für die Radführung;
-   die Festlegung des wesentlichen Lieferumfangs;
-   die auftretenden Kräfte und ihr entsprechendes Abfangen;
-   Toleranzgrenzen.
Diese werden in dieser Norm anhand einer Weiche dargestellt. Die wesentlichen Bauteile von Weichen und Kreuzungen sind in Weichen enthalten und die Grundsätze, die für Weichen angewandt werden, sind gleichermaßen auf umfangreichere Weichenanlagen anwendbar.

Applications ferroviaires - Voie - Appareils de voie - Partie 2: Exigences de la conception géométrique

Cette partie de l’EN 13232 couvre les sujets suivants :
-   description du processus de conception des appareils de voie, ainsi que de l’utilisation des autres parties de la présente norme ;
-   principes de conception géométrique pour le guidage des roues ;
-   définition des limites essentielles pour la fourniture ;
-   forces appliquées et leur support adéquat ;
-   niveaux des tolérances.
Ces sujets sont illustrés par des applications à un branchement. Les principaux composants des appareils de voie sont représentés dans des branchements. Les principes appliqués dans les branchements sont également applicables dans les assemblages plus complexes.

Železniške naprave - Zgornji ustroj proge - Kretnice in križišča za Vignolove tirnice - 2. del: Geometrijske zahteve pri načrtovanju

General Information

• Status: Not Published
• Publication Date: 21-Mar-2016
• Withdrawal Date: 21-Sep-2016
• ICS: 93.100 - Construction of railways
• Technical Committee: CEN/TC 256 - Railway applications
• Drafting Committee: CEN/TC 256/SC 1/WG 18 - Switches and crossings - Performance and acceptance
• Current Stage: 4098 - Decision to abandon - Enquiry
• Start Date: 15-Apr-2016
• Completion Date: 14-Apr-2025
• Directive: 2008/57/EC - Directive 2008/57/EC of the European Parliament and of the Council of 17 June 2008 on the interoperability of the rail system within the Community (Recast)
• Mandate: M/483 - Mandate for programming and standardisation addressed to the European standardisation bodies under directive 2008/57/EC in the field of the interoperability of the rail system within the European Union
• Ref Project: oSIST prEN 13232-2:2014 - Railway applications - Track - Switches and crossings for Vignole rails - Part 2: Requirements for geometric design

Relations

• Revises: EN 13232-2:2003+A1:2011 - Railway applications - Track - Switches and crossings - Part 2: Requirements for geometric design
• Effective Date: 27-Nov-2013

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2014
äHOH]QLãNHQDSUDYH=JRUQMLXVWURMSURJH.UHWQLFHLQNULåLãþD]D9LJQRORYHWLUQLFH
GHO*HRPHWULMVNH]DKWHYHSULQDþUWRYDQMX
Railway applications - Track - Switches and crossings for Vignole rails - Part 2:
Requirements for geometric design
Bahnanwendungen - Oberbau - Weichen und Kreuzungen für Vignolschienen - Teil 2:
Anforderungen an den geometrischen Entwurf
Applications ferroviaires - Voie - Appareils de voie - Partie 2: Exigences de la conception
géométrique
Ta slovenski standard je istoveten z: prEN 13232-2 rev
ICS:
45.080 7UDþQLFHLQåHOH]QLãNLGHOL Rails and railway
components
93.100 Gradnja železnic Construction of railways
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2014
ICS 93.100 Will supersede EN 13232-2:2003+A1:2011
English Version
Railway applications - Track - Switches and crossings for
Vignole rails - Part 2: Requirements for geometric design
Applications ferroviaires - Voie - Appareils de voie - Partie Bahnanwendungen - Oberbau - Weichen und Kreuzungen
2: Exigences de la conception géométrique für Vignolschienen - Teil 2: Anforderungen an den
geometrischen Entwurf
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 256.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13232-2 rev:2014 E
worldwide for CEN national Members.

prEN 13232-2:2014 (E)
Contents
Page
Foreword .4
1 Scope .5
2 Normative references .5
3 General design process .5
3.1 General process .5
3.2 Design step details .6
3.3 Practical use of the design process .6
4 General Design (step 1) .7
4.1 Introduction .7
4.2 General requirements .7
4.2.1 References, terms and definitions .7
4.2.2 General tangency rules .8
4.2.3 Inputs .8
4.3 Design Rules . 10
4.3.1 Speed relationships . 10
4.3.2 Effects of changes in curvature . 11
4.3.3 Switches and crossings on curves . 15
4.4 Output . 16
5 Main constructional design (step 2) . 16
5.1 Introduction . 16
5.2 Inputs . 17
5.3 Structural requirements . 18
5.3.1 General requirements . 18
5.3.2 Specific requirements . 18
5.3.3 Other requirements. 19
5.4 Actuation, locking and detection design . 20
5.5 Output – Main construction documents . 20
5.5.1 Geometry . 20
5.5.2 Guidance . 20
5.5.3 Actuation . 20
5.5.4 Constructional . 20
5.5.5 Information lists . 21
6 Detailed component design (step 3) . 21
6.1 Switches . 21
6.2 Crossings . 21
6.3 Expansion devices. 21
6.4 Other components . 21
6.5 Output – Assembly documents . 22
6.5.1 Main assembly documents . 22
6.5.2 Optional documents . 24
7 Tolerances . 24
7.1 Individual tolerances . 24
7.2 Accumulation of tolerances . 24
7.3 Acceptance basis. 24
Annex A (informative) Design criteria . 25
A.1 Design Process . 25
A.2 Geometry design. 25
prEN 13232-2:2014 (E)
A.3 Wheel rail interaction . 27
A.4 Actuation, locking and detection conformity . 29
A.5 Switch design . 30
A.6 Crossing design (with fixed parts) . 33
A.7 Crossing design (with moveable parts) . 35
A.8 Expansion devices . 38
A.9 Layouts . 38

prEN 13232-2:2014 (E)
Foreword
This document (prEN 13232-2:2014) has been prepared by Technical Committee CEN/TC 256 “Railway
applications”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13232-2:2003+A1:2011.
This series of standards “Railway applications – Track – Switches and crossings for Vignole rails” covers the
design and quality of switches and crossings in flat bottomed rail. The list of Parts is as follows:
 Part 1: Definitions
 Part 2: Requirements for geometric design
 Part 3: Requirements for wheel/rail interaction
 Part 4: Actuation, locking and detection
 Part 5: Switches
 Part 6: Fixed common and obtuse crossings
 Part 7: Crossings with moveable parts
 Part 8: Expansion devices
 Part 9 : Layouts
Part 1 contains terminology used throughout all parts of this series. Parts 2 to 4 contain basic design guides
and are applicable to all switch and crossing assemblies. Parts 5 to 8 deal with particular types of equipment
including their tolerances. These use Parts 1 to 4 as a basis. Part 9 defines the functional and geometric
dimensions and tolerances for layout assembly.
The following terms are used within to define the parties involved in using the EN as the technical basis for a
transaction:
Customer the Operator or User of the equipment, or the Purchaser of the equipment on the User's behalf.
Supplier the Body responsible for the use of the EN in response to the Customer's requirements.
prEN 13232-2:2014 (E)
1 Scope
This part of this European Standard covers the following subjects:
 describe the design process of switches and crossings, and the use of the other parts of this standard;
 geometric design principles for wheel guidance;
 definition of basic limits of supply;
 applied forces and their adequate support;
 tolerance levels.
These are illustrated herein by application to a turnout. The main switch and crossing components are
represented in turnouts and the principles used in turnouts apply equally to more complex layouts.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
prEN 13232-1:2013, Railway applications – Track – Switches and crossings for Vignole rails – Part 1:
Definitions
prEN 13232-3:2014, Railway applications – Track – Switches and crossings for Vignole rails – Part 3:
Requirements for wheel/rail interaction
prEN 13232-5:2014, Railway applications – Track – Switches and crossings for Vignole rails – Part 5:
Switches
prEN 13232-9:2014, Railway applications – Track – Switches and crossings for Vignole rails – Part 9: Layouts
UIC 505-4:2007, Effects of the application of the kinematic gauges defined in the 505 series of leaflets on the
positioning of structures in relation to the tracks and of the tracks in relation to each other
3 General design process
3.1 General process
The design process of switches and crossings is complex due to the many requirements that apply and the
different situations that may occur. Figure 1 gives a schematic representation of the general design process. It
separates the whole process into 4 main steps:
 step 1 contains the general design of the S&C. It consists of the geometrical design, the design of the
wheel-rail interaction and the design requirements for compliance with the actuation, locking and
detection system. It permits the definition of the main aspects of the S&C, respecting the main design
requirements. Geometric design is defined in this part; other aspects are dealt with in parts 3 and 4;
 step 2 is the main constructional design process, which specifies the main construction of the S&C. It is
based on the technology used by the supplier and is not dealt with in detail by any standard. It is mainly
based on the suppliers’ experience and expertise;
 step 3 consists of the detailed design of the individual components. It is dealt with in different standards.
The design of the main components shall respect the requirements laid down in parts 5 to 8. Other
components, such as fastenings, bearers, etc, are dealt with in respective EN’s;
prEN 13232-2:2014 (E)
 step 4 is the product acceptance, which is described in Part 9.

Key
1 Step 1: General design
2 Step 2: Main constructional design
3 Step 3: Detailed component design
4 Step 4: Acceptance
Figure 1 — General design process
3.2 Design step details
a) Every design step requires sufficient input data to enable the design to be completed.
b) Input data is dealt with by the supplier through the design rules. The rules are defined in EN 13232,
Parts 2 to 8.
c) The results of the different design steps are outputs.
All these aspects are schematically represented for each design step in Annex A, with a reference to the
different parts and clauses where these aspects are dealt with in detail.
3.3 Practical use of the design process
The previous scheme deals with the complete design process of the S&C. The use of the standard is not
limited to this case only.
The customer may choose to request the supplier to perform the whole design process and therefore gives all
necessary input data to permit the supplier to perform the design.
The customer may also opt to request the supplier to perform only parts of the design process. In this case the
customer shall deliver all inputs of the design steps he has requested the supplier to perform. This means that
he has to deliver all outputs of the previous design steps.
EXAMPLE 1 The customer may request to perform the detailed design of an S&C layout based on the geometry of an
existing design for use on a main railway line. In this case the supplier shall receive from the customer the outputs from
geometrical requirements (the geometry plan) as well as the requirements for wheel-rail interaction, specified by the
functional and safety dimensions.
Based on this information and the inputs for both conformity for actuation, locking and detection (ALD) and general
requirements, he performs the general and detailed component design.
EXAMPLE 2 The customer may request the supplier to fabricate an S&C layout in accordance with an existing design.
He therefore shall deliver all detailed plans to the supplier. The supplier only has to do step 4 of the general design
process.
prEN 13232-2:2014 (E)
4 General Design (step 1)
4.1 Introduction
Geometry is represented in the running plane by the running edges. For the purpose of determination of
permissible speeds and for definition of the turnout, curvature is defined by the radius of the track centreline.
The guiding principles of curves are given in this standard as they apply to switches and crossings. Switches
and crossings are normally designed without differential cant; particular requirements shall be specified.
In order to maintain safe and continuous support and guidance of wheels, certain rules of tangency are
imposed. Speed and radius are then related to lateral acceleration. Cant deficiency is derived from this.
Switches and crossings are characterised by changes in lateral acceleration, so rules for both steady and
sudden changes between radii are included in this section.
Calculations and rules relate to vehicles with 2 axles or vehicles with 2-axle bogies. Vehicles with other than
2 axles may require special consideration and as such their configuration shall be provided by the Customer.
These rules are defined for steady-state design, i.e. without acceleration. Requirements of a dynamic nature
shall be stated by the Customer.
4.2 General requirements
4.2.1 References, terms and definitions
For the purposes of this part of the European Standard, the terms and definitions given in prEN 13232-1:2013
and the following apply.
Key reference points relating to turnout geometry and the limits of supply of a turnout are illustrated in
Figure 2.
Key
1 Actual switch toe   6 Limits of supply (front joints)
2 Mathematical point of switch  7 Origin of switch curve
3 Tumout intersection   8 Centreline radius
4 Theoretical intersection   9 Turnout angle
5 Limits of supply (heel joints)
Figure 2 — Key reference points
prEN 13232-2:2014 (E)
4.2.2 General tangency rules
At any change in radius the two radii shall be mutually tangential at the running edges. To achieve this, the
centres of adjacent curves shall lie on the same radial line (see Figure 3).
Exceptions to the mutual tangency rule may occur. These are:
 along the low-side curve of a turnout where variation in track gauge occurs;
 at the switch toe, for example, to shorten the switch rail.
Details are given in prEN 13232-3:2014 and prEN 13232-5:2014.

Key
1 Tangent
Figure 3 — Mutual tangency
4.2.3 Inputs
For a concise definition of the geometry of an assembly of switches and crossings, a minimum amount of
basic quantitative information is required. The following items are both necessary and sufficient for such a
definition of a turnout. Refer also to clause A.1.
The following shall be defined by the Customer and numerical values provided to the Supplier. Note that some
values may be different from those for plain line:
 track gauge;
 speed;
 maximum lateral acceleration or cant deficiency;
 maximum rate of change of lateral acceleration or cant deficiency;
 turnout intersection point and angle (see Figure 4);
 limits of supply (front joints, heel joints);
 lowside track gauge variation (if any).
For a crossover or junction, in addition, the following shall be defined by the Customer and provided to the
Supplier:
prEN 13232-2:2014 (E)
 distance between main line track centrelines.
For switches and crossings on a curved main line, the following must be defined and provided by the
Customer:
 main line curvature;
 main line and branch line cant through turnout.
The key points whose location shall be agreed between Customer and Supplier are as follows:
 origin of switch curve;
 real switch toe (RP);
 theoretical intersection (of crossing).

Key
1 Overall length
2 Tangent length
3 Turnout intersection
4 Turnout angle
Figure 4 — Setting out diagram
Radii of main and branch lines and the positions at which they change shall be agreed, for example as
illustrated in Figure 4, for various types of geometry, together with:
 centreline radii;
 origin of switch curve to positions of changes of radii;
 tangent offset (if any);
where such changes of radii shall be bounded either by included angle, or by longitudinal distance or by
lateral offset, or in the case of a transition section, by such data as is necessary to uniquely define its shape.
prEN 13232-2:2014 (E)
Key
1 Radius
2 Transition
3 Straight
4 Radius 1
5 Radius 2
Figure 5 — Examples of geometry types
4.3 Design Rules
4.3.1 Speed relationships
Fundamental rules of circular motion determine the relationship between radius and speed around a curve.
For railway specific applications the following formula applies:
v = √(a R ) (1)
max max c
where:
R is the local centreline radius of the curve in metre;
c
a is the maximum lateral acceleration in m/s ;
max
v is the maximum local velocity in m/s.
max
Alternatively with V in km/h:
max
prEN 13232-2:2014 (E)
V = 3,6 √(a R ) (2)
max max c
Often it is convenient to express maximum speed in terms of more physical measures, using the variables
cant deficiency and wheel contact gauge. Firstly, wheel contact gauge is expressed conventionally as:
s = s + s (3)
w t r
where:
s is the wheel contact gauge, or distance between the two upper wheel/rail contacts, in millimetre;
w
s is the track gauge in millimetre;
t
s is the rail head width in millimetre.
r
If s is not specified then, for standard gauge (1435 mm), s takes the value 1500 mm. The speed relationship
r w
is then given by:
V = 3,6 √(h g R / s ) (4)
max d c w
where:
h is the maximum permitted cant deficiency in millimetre;
d
g is the acceleration due to gravity, normally taken as 9,81 m/s .
4.3.2 Effects of changes in curvature
4.3.2.1 Introduction
Most real situations yield a step change in curvature, since a smooth curvature change only occurs in
transition curves. The effects of step changes are mitigated by the vehicle's suspension system, but an
approximate rule is necessary to enable the switch and crossing supplier to match the vehicle's requirements.
In the following the rules for steady transitions are covered first, then the rules for step changes in curvature.
See Figure 5 for examples of alternative arrangements of transitions within turnouts.
4.3.2.2 Change of lateral acceleration
The steady change of curvature is quantified by the rate of change of lateral acceleration. Alternatively it may
be termed a rate of change of cant deficiency. This is related to a rate of change of lateral acceleration which
is calculated with the following formula:
dh s
da
d w
= ⋅ (5)
dt g dt
where:
dh
d
is the rate of change of cant deficiency in mm/s;
dt
da
is the rate of change of lateral acceleration in m/s .
dt
prEN 13232-2:2014 (E)
The equations below are defined in terms of the variable A, which can be used with either lateral acceleration
dA dA
2 3
(A in m/s , in m/s ) or cant deficiency (A in mm, in mm/s), the units of measurement depending on
dt dt
which alternative is preferred.
4.3.2.3 Types and locations of transitions
Transition curves are used to eliminate the effects of step changes by employing a suitable rate of change of
lateral acceleration. Speed is calculated according to the sharpest radius using equations 1, 2 and 4 above.
There follow various calculations for transitions. These are based on the steady transition but approximations
to it may be permitted. An example of a steady transition is the clothoid, which employs a constant rate of
change of lateral acceleration. The definition of the clothoid transition curve is:
 
d 
r
 
= constant (6)
dl
where r is the instantaneous radius at an arc length l from the origin.
A characteristic of the clothoid transition curve is that, at cons
...