EN 17997:2025

Railway applications - Braking - Definition of ETCS brake curve parameters for Gamma trains

This document specifies the methodology to define the train related braking model and required emergency and service brake on-board parameters to enable speed and distance monitoring for trains equipped and operated on railway lines using ETCS Baseline 3.
This document is only applicable for ETCS Gamma braking model trains (i.e. the train is said to be a “gamma” train). This document does not specify the way these parameters are transferred to and can be used by the ETCS on-board system (e.g. during start of mission - SoM).
The ETCS “conversion models” are not covered by this document and are described in EN 16834:2019, Annex F. The ETCS “conversion models” are intended for use with trains where the braking performance is expressed using braked weight percentages (“lambda” train).
Any trackside related input parameters, including national values, are not covered in this document. Information can be found in the SUBSET-026 (see [11]).

Bahnanwendungen - Bremsen - Bestimmung der ETCS-Bremskurvenparameter für Gamma-Züge

Dieses Dokument legt die Methodik zur Definition des zugbezogenen Bremsmodells und erforderlichen fahrzeugspezifischen Bremsparameter fest, um Geschwindigkeits- und Wegüberwachung für Züge zu ermöglichen, die auf Eisenbahnstrecken mit ETCS Baseline 3 ausgestattet sind und betrieben werden.
Dieses Dokument gilt nur für Züge, welche das ETCS-Gammamodell verwenden (d. h. der Zug wird als "Gamma"-Zug bezeichnet). In diesem Dokument wird nicht spezifiziert, wie diese Parameter an das ETCS-Bordsystem übertragen und von diesem verwendet werden können (z. B. vor Beginn der Zugfahrt (en: Start of Mission - SoM)).
Die ETCS-Umwandlungsmodelle werden von diesem Dokument nicht abgedeckt und sind in EN 16834:2019, Anhang F beschrieben. Die ETCS-Umwandlungsmodelle sind für die Verwendung mit Zügen vorgesehen, bei denen das Bremsvermögen durch Bremsgewichtsprozentsätze ausgedrückt wird ("Lambda"-Zug).
Alle streckenbezogenen Eingangsgrößen, einschließlich nationaler Werte, werden in diesem Dokument nicht behandelt. Informationen finden sich im SUBSET-026 (siehe [11]).

Applications ferroviaires - Freinage - Détermination des paramètres des courbes de freinage ETCS pour les trains Gamma

Le présent document spécifie la méthodologie permettant de définir le modèle de freinage des trains et les paramètres de freinage embarqués requis pour la surveillance des vitesses et distances des trains équipés du système ETCS 3 et empruntant les lignes ferroviaires utilisant le système ETCS 3.
Le présent document s'applique uniquement aux trains utilisant le modèle de freinage ETCS Gamma (les trains « Gamma »). Le présent document ne spécifie pas comment ces paramètres sont transférés et peuvent être utilisés par le système ETCS embarqué (par exemple, en début de mission - SoM).
Les « modèles de conversion » ETCS ne sont pas couverts par le présent document et sont décrits dans l'EN 16834:2019, Annexe F. Ces modèles sont destinés à être utilisés avec les trains dont les performances de freinage sont exprimées en termes de pourcentages de masse freinée (trains « Lambda »).
Les paramètres d'entrée « sol », y compris les valeurs nationales, ne sont pas traités dans le présent document. Pour plus d'informations, consulter le document SUBSET-026 (voir [11]).

Železniške naprave - Zavore - Opredelitev parametrov zavorne krivulje ETCS za vlake Gamma

General Information

• Status: Published
• Publication Date: 14-Jan-2025
• ICS: 45.060 - Railway rolling stock
• ICS: 45.060.01 - Railway rolling stock in general
• Technical Committee: CEN/TC 256 - Railway applications
• Drafting Committee: CEN/TC 256/SC 3/WG 47 - Braking
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 15-Jan-2025
• Due Date: 15-Jan-2025
• Completion Date: 15-Jan-2025
• Directive: 2016/797/EU - Directive (EU) 2016/797 of the European Parliament and of the Council of 11 May 2016 on the interoperability of the rail system within the European Union (Text with EEA relevance)
• 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: SIST EN 17997:2025 - Railway applications - Braking - Definition of ETCS brake curve parameters for Gamma trains

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2025
Železniške naprave - Zavore - Opredelitev parametrov zavorne krivulje ETCS za
vlake Gamma
Railway applications - Braking - Definition of ETCS brake curve parameters for Gamma
trains
Bahnanwendungen - Bremsen - Bestimmung der ETCS-Bremskurvenparameter für
Gamma-Züge
Applications ferroviaires - Freinage - Détermination des paramètres des courbes de
freinage ETCS pour les trains Gamma
Ta slovenski standard je istoveten z: EN 17997:2025
ICS:
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 17997
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2025
EUROPÄISCHE NORM
ICS 45.060.01
English Version
Railway applications - Braking - Definition of ETCS brake
curve parameters for Gamma trains
Applications ferroviaires - Freinage - Détermination Bahnanwendungen - Bremsen - Bestimmung der ETCS-
des paramètres des courbes de freinage ETCS pour les Bremskurvenparameter für Gamma-Züge
trains Gamma
This European Standard was approved by CEN on 25 November 2024.

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. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17997:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 6
Introduction . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions, symbols and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Symbols and abbreviated terms . 10
4 ETCS on-board brake model parameters . 11
4.1 ETCS on-board emergency brake model parameters . 11
4.1.1 Nominal emergency brake deceleration A . 11
nominal
4.1.2 Correction factor K (C,V,EBCL) . 11
dry
4.1.3 Correction factor K (C,V) . 12
wet
4.1.4 Emergency brake response time . 12
4.1.5 Traction cut-off time . 12
4.2 ETCS on-board service brake model parameters . 12
4.2.1 General. 12
4.2.2 Nominal service brake deceleration A . 12
nominalSB
4.2.3 Service brake response time . 12
4.2.4 Normal service brake deceleration and correction factors K . 12
n
5 Brake system architecture model . 13
5.1 General. 13
5.2 General procedure description for K (C,V,EBCL) determination . 14
dry
5.2.1 General. 14
5.2.2 Step 1: Bottom-up functional analysis. 14
5.2.3 Step 2: Top-down impact analysis . 16
5.2.4 Step 3: Model simplification . 17
5.3 Mathematical model building. 18
6 Input data. 20
6.1 General. 20
6.2 Origin of input data . 20
6.3 Validity of input data . 21
7 Determination of ETCS emergency brake model parameters . 22
7.1 Parameters . 22
7.1.1 General. 22
7.1.2 ETCS brake parameters set approaches . 24
7.1.3 Approach dependency . 25
7.1.4 Resolution of ETCS brake parameters. 26
7.2 Nominal emergency brake deceleration . 26
7.2.1 General. 26
7.2.2 Determination by dynamic brake testing . 27
7.2.3 Determination by calculation . 33
7.2.4 Determination at degraded conditions . 34
7.2.5 Determination for multiple unit operation . 34
7.3 Correction factor K (C,V,EBCL) . 35
dry
7.3.1 General . 35
7.3.2 Determination of weighting factors α (C,V) . 37
j
7.3.3 Determination of factors β (i,C,V) . 37
j
7.3.4 Determination of factors α' (C,V) and β' (C,V) . 39
k k
7.3.5 Determination of correction factor K (C,V,EBCL) with Monte Carlo method . 40
dry
7.4 Correction factor K (C,V) . 40
wet
7.4.1 General method for determination of K (C,V) . 40
wet
7.4.2 Determination of K (C,V) for wheel/rail adhesion independent brake units . 41
wet
7.5 Emergency brake time characteristic . 42
7.5.1 General . 42
7.5.2 Multiple units operation . 42
7.6 Traction cut-off time . 43
7.6.1 General . 43
7.6.2 Multiple units operation . 44
8 Determination of ETCS service brake model parameters . 44
8.1 General . 44
8.2 Nominal deceleration for service braking . 44
8.3 Service brake response time . 44
8.4 Normal service brake deceleration and correction factors Kn . 44
9 Common set of parameters . 45
10 Validation of the calculation tool . 45
10.1 General . 45
10.2 Verification using a simplified model . 46
10.3 Validation by example calculations . 46
11 Documentation . 47
11.1 General . 47
11.2 Brake system architecture model . 47
11.3 Input data . 47
11.4 Nominal values . 47
11.5 Correction factors . 48
11.6 Source list . 48
Annex A (informative) Basic formulae for the commonly used types of brake unit . 49
A.1 General . 49
A.2 Factor β (i,C,V) . 49
j
A.2.1 Internal and external parameters for tread brake unit . 49
A.2.2 Internal and external parameters for disc brake unit . 51
A.2.3 Internal and external parameters for magnetic track brake unit . 53
A.2.4 Internal and external parameters for eddy current brake unit . 54
A.2.5 Internal and external parameters for electro-dynamic brake. 57
A.3 Factor βj’(i,C,V) . 58
Annex B (informative) Derivation of the formulae for K (C,V,EBCL) .
...