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 Gama

General Information

• Status: Not 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: 6055 - CEN Ratification completed (DOR) - Publishing
• Start Date: 25-Nov-2024
• Due Date: 13-Dec-2024
• Completion Date: 25-Nov-2024
• 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: kSIST FprEN 17997:2024 - Railway applications - Braking - Definition of ETCS brake curve parameters for Gamma trains

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 17997-1:2023
01-november-2023
Železniške naprave - Zavore - Opredelitev parametrov zavorne krivulje ETCS za
vlake Gama - 1. del: Parametri krivulje zaviranja v sili
Railway applications - Braking - Definition of ETCS brake curve parameters for Gamma
trains - Part 1: Emergency brake curve parameters
Bahnanwendungen - Bremsen - Bestimmung der ETCS-Bremskurvenparameter für
Gamma-Züge - Teil 1: Schnellbremskurvenparameter
Applications ferroviaires - Freinage - Détermination des paramètres des courbes de
freinage ETCS pour les trains Gamma - Partie 1 : Paramètres des courbes de freinage
d’urgence
Ta slovenski standard je istoveten z: prEN 17997-1
ICS:
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
oSIST prEN 17997-1:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 17997-1:2023
oSIST prEN 17997-1:2023
DRAFT
EUROPEAN STANDARD
prEN 17997-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2023
ICS 45.060; 45.060.01
English Version
Railway applications - Braking - Definition of ETCS brake
curve parameters for Gamma trains - Part 1: Emergency
brake curve parameters
Applications ferroviaires - Freinage - Détermination Bahnanwendungen - Bremsen - Bestimmung der ETCS-
des paramètres des courbes de freinage ETCS pour les Bremskurvenparameter für Gamma-Züge - Teil 1:
trains au Gamma - Partie 1 : paramètres pour les Schnellbremskurvenparameter
courbes de freinage d'urgence
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, 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.
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: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17997-1:2023 E
worldwide for CEN national Members.

oSIST prEN 17997-1:2023
prEN 17997-1:2023 (E)
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 . 9
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) . 11
wet
4.1.4 Emergency brake response time . 11
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 AnominalSB . 12
4.2.3 Service brake response time . 12
4.2.4 Normal service brake deceleration and K correction factors . 12
n
5 Brake system architecture model . 12
5.1 General. 12
5.2 General procedure description for K (C, V, EBCL) determination . 13
dry
5.2.1 General. 13
5.2.2 Step 1: Bottom-up functional analysis. 14
5.2.3 Step 2: Top-down impact analysis . 15
5.2.4 Step 3: Model simplification . 16
5.3 Mathematical model building based on step 1-3 . 17
6 Input data. 19
6.1 General. 19
6.2 Origin of input data statistical definition . 19
6.3 Validity of input data . 20
7 Determination of ETCS emergency brake model parameters . 20
7.1 Parameters . 20
7.1.1 General. 20
7.1.2 ETCS brake parameters set . 23
7.1.3 Approach dependency . 24
7.1.4 Resolution of ETCS brake parameters. 25
7.2 Nominal deceleration for emergency braking . 25
7.2.1 General. 25
7.2.2 Determination by dynamic brake testing . 26
7.2.3 Determination by calculation . 31
7.2.4 Determination at degraded conditions . 32
7.2.5 Determination for multiple unit operation . 32
7.3 Correction factor K (C, V, EBCL) . 33
dry
oSIST prEN 17997-1:2023
prEN 17997-1:2023 (E)
7.3.1 General . 33
7.3.2 Determination of weighting factors α (C,V) . 35
j
7.3.3 Determination of factors β (i, C, V) . 35
j
7.3.4 Determination of factors α' (C,V) and β' (C,V) . 37
k k
7.3.5 Correction factor K (C, V, EBCL) with Monte Carlo method . 38
dry
7.4 Correction factor K (C, V) . 38
wet
7.4.1 Determination of correction factor K (C,V) . 38
wet
7.4.2 Determination of correction factor K (C,V) in case brake units that are independent
wet
from wheel/rail adhesion are used. 39
7.5 Emergency brake build-up time . 39
7.5.1 General . 39
7.5.2 Multiple units operation . 40
7.6 Traction cut-off time . 40
7.6.1 General . 40
7.6.2 Multiple units operation . 41
8 Determination of ETCS service brake model parameters . 42
8.1 General . 42
8.2 Nominal deceleration for service braking . 42
8.3 Service brake response time . 42
8.4 Nominal service brake deceleration and K correction factors . 42
n
9 Common set of parameters . 42
10 Validation of the calculation tool . 43
10.1 General . 43
10.2 Verification using a simplified model . 44
10.3 Validation by example calculations . 44
11 Documentation . 44
11.1 General . 44
11.2 Brake system architecture model . 45
11.3 Input data . 45
11.4 Nominal values . 45
11.5 Correction factors . 45
11.6 Source list . 46
11.7 Source list . 46
Annex A (informative) Basic formulas for the commonly used types of brake unit . 47
A.1 General .
...