EN 50126-2:2017/A1:2024

Railway applications - The specification and demonstration of Reliability, Availability, Maintainability and Safety (RAMS) - Part 2: Systems approach to safety

Scope remains the same as EN50126-2:2017

Bahnanwendungen - Spezifikation und Nachweis von Zuverlässigkeit, Verfügbarkeit, Instandhaltbarkeit und Sicherheit (RAMS) - Teil 2: Systembezogene Sicherheitsmethodik

Applications ferroviaires - Spécification et démonstration de la fiabilité, de la disponibilité, de la maintenabilité et de la sécurité (FDMS) - Partie 2: Approche systématique pour la sécurité

Železniške naprave - Specifikacija in prikaz zanesljivosti, razpoložljivosti, vzdrževalnosti in varnosti (RAMS) - 2. del: Sistemski pristop k varnosti - Dopolnilo A1

General Information

• Status: Published
• Publication Date: 14-Nov-2024
• ICS: 45.020 - Railway engineering in general
• Technical Committee: CLC/TC 9X - Electrical and electronic applications for railways
• Drafting Committee: CLC/TC 9X/WG 21 - Revision of EN 50126-1 & -2
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 15-Nov-2024
• Due Date: 10-Oct-2024
• Completion Date: 15-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
• Mandate: M/591 - Standardisation request to the European Committee for Standardisation and the European Committee for Electrotechnical Standardisation as regards railway products in support of Directive (EU) 2016/797
• Ref Project: SIST EN 50126-2:2018/FprA1:2024 - Railway Applications - The Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS) - Part 2: Systems Approach to Safety

Relations

• Amends: EN 50126-2:2017 - Railway Applications - The Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS) - Part 2: Systems Approach to Safety
• Effective Date: 08-Mar-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 50126-2:2018/oprA1:2023
01-april-2023
Železniške naprave - Specifikacija in prikaz zanesljivosti, razpoložljivosti,
vzdrževalnosti in varnosti (RAMS) - 2. del: Sistemski pristop k varnosti - Dopolnilo
A1
Railway Applications - The Specification and Demonstration of Reliability, Availability,
Maintainability and Safety (RAMS) - Part 2: Systems Approach to Safety
Bahnanwendungen - Spezifikation und Nachweis von Zuverlässigkeit, Verfügbarkeit,
Instandhaltbarkeit und Sicherheit (RAMS) - Teil 2: Systembezogene Sicherheitsmethodik
Applications ferroviaires - Spécification et démonstration de la fiabilité, de la disponibilité,
de la maintenabilité et de la sécurité (FDMS) - Partie 2: Approche systématique pour la
sécurité
Ta slovenski standard je istoveten z: EN 50126-2:2017/prA1
ICS:
03.120.01 Kakovost na splošno Quality in general
45.020 Železniška tehnika na Railway engineering in
splošno general
SIST EN 50126-2:2018/oprA1:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN 50126-2:2018/oprA1:2023

SIST EN 50126-2:2018/oprA1:2023

EUROPEAN STANDARD DRAFT
EN 50126-2:2017
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
February 2023
ICS 45.020 -
English Version
Railway Applications - The Specification and Demonstration of
Reliability, Availability, Maintainability and Safety (RAMS) - Part
2: Systems Approach to Safety
Applications ferroviaires - Spécification et démonstration de Bahnanwendungen - Spezifikation und Nachweis von
la fiabilité, de la disponibilité, de la maintenabilité et de la Zuverlässigkeit, Verfügbarkeit, Instandhaltbarkeit und
sécurité (FDMS) - Partie 2: Approche systématique pour la Sicherheit (RAMS) - Teil 2: Systembezogene
sécurité Sicherheitsmethodik
This draft amendment prA1, if approved, will modify the European Standard EN 50126-2:2017; it is submitted to CENELEC members for
enquiry.
Deadline for CENELEC: 2023-04-28.

It has been drawn up by CLC/TC 9X.

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

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

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the 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 Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 75808 Ref. No. EN 50126-2:2017/prA1 E

SIST EN 50126-2:2018/oprA1:2023
EN 50126-2:2017/prA1:2023 (E)
Contents Page
European foreword . 3
1 Modification to references . 4
2 Modification to Clause 2, "Normative References" . 4
3 Modification to Clause 10, "Apportionment of functional Safety Integrity requirements" . 4
4 Modification to Annex ZZ . 4

SIST EN 50126-2:2018/oprA1:2023
EN 50126-2:2017/prA1:2023 (E)
European foreword
This document (EN 50126-2:2017/prA1:2023) has been prepared by Technical Committee CLC/TC 9X
“Electrical and electronic applications for railways”, the secretariat of which is held by France.
This document is currently submitted to the Enquiry.
The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)

This document has been prepared under a Standardization Request given to CENELEC by the European
Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s)
/ Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZZ, which is an integral part of this
document.
SIST EN 50126-2:2018/oprA1:2023
EN 50126-2:2017/prA1:2023 (E)
1 Modification to references
Throughout the text replace EN 50126-1 with EN 50126-1:2017, and EN 50126-1:2017 with
EN 50126-1:2017, .
2 Modification to Clause 2, "Normative References"
Replace the following reference:
EN 50126-1:2017, Railway Applications — The Specification and Demonstration of Reliability, Availability,
Maintainability and Safety (RAMS) — Part 1: Generic RAMS Process
with the following new reference:
EN 50126-1:2017, Railway Applications — The Specification and Demonstration of Reliability, Availability,
Maintainability and Safety (RAMS) — Part 1: Generic RAMS Process
3 Modification to Clause 10, "Apportionment of functional Safety Integrity
requirements"
Replace the following text:
-5 -1
"In case the derived TFFR is less demanding (higher) than 10 [h ], the function shall be given the attribute of
“basic integrity”, with related requirements defined in 10.2.11."
with the following text:
-5 -1
“In case the derived TFFR is equal to 10 [h ] or higher (less demanding), the function shall be given the
attribute of “basic integrity”, with related requirements defined in 10.2.11.”
4 Modification to Annex ZZ
Replace the entire Annex ZZ with the following:

As amended by EN 50126-1:2017/prA1:2023.
SIST EN 50126-2:2018/oprA1:2023
EN 50126-2:2017/prA1:2023 (E)
“
Annex ZZ
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive (EU) 2016/797 aimed to be covered
This European Standard has been prepared under a Commission’s standardisation request “M/483 Mandate to
CEN and CENELEC for Standardisation in the field of interoperability of the rail system" to provide one voluntary
means of conforming to (parts of) Essential Requirements of Directive (EU) 2016/797 of the European
Parliament and of the Council of 11 May 2016 on interoperability of the rail system (recast) as specified in the
relevant technical specifications for interoperability (TSI).
Once this standard is cited in the Official Journal of the European Union under that Directive, compliance with
the normative clauses of this standard given in Table ZZ.1 for control-command and signalling, Table ZZ.2 for
locomotive and passenger RST and Table ZZ.3 for freight wagons RST confers, within the limits of the scope
of this standard, a presumption of conformity with
...