SIST EN 50128:2011/A1:2020

Railway applications - Communication, signalling and processing systems - Software for railway control and protection systems

2021: CLC legacy converted by DCLab NISOSTS

Bahnanwendungen - Telekommunikationstechnik, Signaltechnik und Datenverarbeitungssysteme - Software für Eisenbahnsteuerungs- und Überwachungssysteme

Applications ferroviaires - Systèmes de signalisation, de télécommunication et de traitement - Logiciels pour systèmes de commande et de protection ferroviaire

Železniške naprave - Komunikacijski, signalni in procesni sistemi - Programska oprema za železniške krmilne in zaščitne sisteme - Dopolnilo A1

General Information

• Status: Published
• Publication Date: 07-Apr-2020
• ICS: 35.240.60 - IT applications in transport
• ICS: 45.020 - Railway engineering in general
• ICS: 93.100 - Construction of railways
• Technical Committee: ŽEN - Electrical applications for railways
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 10-Mar-2020
• Due Date: 15-May-2020
• Completion Date: 08-Apr-2020
• 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: EN 50128:2011/A1:2020 - Railway applications - Communication, signalling and processing systems - Software for railway control and protection systems

Relations

• Amends: SIST EN 50128:2011 - Railway applications - Communication, signalling and processing systems - Software for railway control and protection systems
• Effective Date: 23-Jul-2019
• Revised: SIST EN 50716:2024 - Railway Applications - Requirements for software development
• Effective Date: 01-Mar-2024

Overview

SIST EN 50128:2011/A1:2020 is the CENELEC amendment that updates the 2011 European standard for software used in railway control and protection systems. Prepared by CLC/SC 9XA and published in 2020, this amendment clarifies the software lifecycle, verification and safety-related aspects that underpin reliable railway signalling and control software. It supports the essential requirements of EU Directive 2016/797/EU (see Annex ZZ) and provides a route to conformity where the standard is cited in the Official Journal of the European Union.

Key contextual facts:

• Scope covers software for communication, signalling and processing systems used in railway control and protection.
• Amendment A1 was approved by CENELEC on 2019-07-23 and published February 2020.
• Relevant ICS codes: 35.240.60 (IT in transport) and 45.020 (Railway engineering).

Key Topics

This amendment focuses on practical and normative topics essential for safety-critical railway software without prescribing specific proprietary techniques. Core subjects include:

• Software lifecycle and development processes: guidance on systematic lifecycle management to achieve predictable, safe software behaviour.
• Safety and verification: emphasis on verification, validation and evidence to demonstrate compliance with safety objectives.
• Responsibility and assessment: clarifies manufacturer responsibilities and assessment practices for software constituents and subsystems.
• Conformity and regulatory alignment: relationship with the Control-Command and Signalling TSI and EU Directive 2016/797/EU (Annex ZZ).

Applications

SIST EN 50128:2011/A1:2020 is applicable across organizations involved in the development, procurement and assessment of software for railway signalling and control, including:

• Software engineers and system integrators implementing control and protection logic.
• Safety assessors and certification bodies evaluating software evidence for interoperability and regulatory compliance.
• Project managers and procurement teams requiring contractual references for software assurance and lifecycle controls.

Key practical benefits:

• Enables a structured approach to achieving compliant, interoperable and reliable railway software.
• Provides a common reference for suppliers and authorities across CENELEC member countries.
• Facilitates evidence-based assessment tied to EU interoperability requirements.

Related Standards

For a complete compliance strategy, EN 50128 is typically used alongside other railway standards and specifications, including but not limited to:

• Control-Command and Signalling TSI (REGULATION (EU) No 2016/919)
• Applicable national adoptions and endorsements of SIST EN 50128:2011/A1:2020

For implementation, consult the official SIST EN 50128:2011/A1:2020 text and Annex ZZ for the relationship to EU Directive 2016/797/EU. National standards bodies and the CEN-CENELEC Management Centre provide up-to-date lists of national adoptions and bibliographic references.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2020
Železniške naprave - Komunikacijski, signalni in procesni sistemi - Programska
oprema za železniške krmilne in zaščitne sisteme - Dopolnilo A1
Railway applications - Communication, signalling and processing systems - Software for
railway control and protection systems
Bahnanwendungen - Telekommunikationstechnik, Signaltechnik und
Datenverarbeitungssysteme - Software für Eisenbahnsteuerungs- und
Überwachungssysteme
Applications ferroviaires - Systèmes de signalisation, de télécommunication et de
traitement - Logiciels pour systèmes de commande et de protection ferroviaire
Ta slovenski standard je istoveten z: EN 50128:2011/A1:2020
ICS:
35.240.60 Uporabniške rešitve IT v IT applications in transport
prometu
45.020 Železniška tehnika na Railway engineering in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50128:2011/A1

NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2020
ICS 35.240.60; 45.020; 93.100
English Version
Railway applications - Communication, signalling and processing
systems - Software for railway control and protection systems
Applications ferroviaires - Systèmes de signalisation, de Bahnanwendungen - Telekommunikationstechnik,
télécommunication et de traitement - Logiciels pour Signaltechnik und Datenverarbeitungssysteme - Software
systèmes de commande et de protection ferroviaire für Eisenbahnsteuerungs- und Überwachungssysteme
This amendment A1 modifies the European Standard EN 50128:2011; it was approved by CENELEC on 2019-07-23. 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.
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 CENELEC member.
This amendment exists 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,
Turkey and the United Kingdom.

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
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50128:2011/A1:2020 E

European foreword
This document (EN 50128:2011/A1:2020) has been prepared by CLC/SC 9XA
"Communication, signalling and processing systems".
The following dates are fixed
...