EN 50121-4:2016/A1:2019
(Amendment)Railway applications - Electromagnetic compatibility - Part 4: Emission and immunity of the signalling and telecommunications apparatus
Railway applications - Electromagnetic compatibility - Part 4: Emission and immunity of the signalling and telecommunications apparatus
This European Standard applies to signalling and telecommunication apparatus that is installed inside the railway environment. Signalling and telecommunication apparatus mounted in vehicles is covered by EN 50121-3-2:2016, signalling and telecommunication apparatus installed inside the substation and connected to substation equipment is covered by EN 50121-5:2016. This European Standard specifies limits for emission and immunity and provides performance criteria for signalling and telecommunications (S&T) apparatus (including power supply systems belonging to S&T) which may interfere with other apparatus inside the railway environment, or increase the total emissions for the railway environment and so risk causing Electro-Magnetic Interference (EMI) to apparatus outside the railway system. The requirements specified in this standard apply for: — vital equipment such as interlocking or command and control; — apparatus inside the 3 m zone; — ports of apparatus inside the 10 m zone with connection inside the 3 m zone; — ports of apparatus inside the 10 m zone with cable length > 30 m. Other apparatus not covered by at least one of these given cases should be in compliance with EN 61000-6-2. If a port is intended to transmit or receive for the purpose of radio communication (intentional radiators, e.g. transponder systems), then the radiated emission requirement in this standard are not intended to be applicable to the intentional transmission from a radio-transmitter as defined by the ITU. Immunity limits do not apply in the exclusion bands as defined in the corresponding EMC related standard for radio equipment. The standard does not specify basic personal safety requirements for apparatus such as protection against electric shock, unsafe operation, insulation co-ordination and related dielectric tests. The requirements were developed for and are applicable to this set of apparatus when operating under normal conditions. Fault conditions of the apparatus have not been taken into account. The frequency range considered is from DC to 400 GHz. No measurements need to be performed at frequencies where no requirement is specified. For products in the scope of EN 61000-3-2, EN 61000-3-3, EN 61000-3-11 or EN 61000-3-12 the requirements of those standards also apply. These specific provisions are to be used in conjunction with the general provisions in EN 50121-1:2016. The immunity and emission levels do not of themselves guarantee that the integration of apparatus will necessarily be satisfactory. The standard cannot cover all the possible configurations of the apparatus, but the test levels are sufficient to achieve satisfactory EMC in the majority of cases.
Bahnanwendungen - Elektromagnetische Verträglichkeit - Teil 4: Störaussendungen und Störfestigkeit von Signal- und Telekommunikationseinrichtungen
Applications ferroviaires - Compatibilité électromagnétique - Partie 4: Emission et immunité des appareils de signalisation et de télécommunication
Železniške naprave - Elektromagnetna združljivost - 4. del: Sevanje in odpornost signalnih in telekomunikacijskih naprav
General Information
- Status
- Published
- Publication Date
- 04-Apr-2019
- Withdrawal Date
- 23-Oct-2019
- Technical Committee
- CLC/TC 9X - Electrical and electronic applications for railways
- Drafting Committee
- CLC/TC 9X - Electrical and electronic applications for railways
- Current Stage
- 6060 - Document made available - Publishing
- Start Date
- 05-Apr-2019
- Due Date
- 17-Apr-2021
- Completion Date
- 05-Apr-2019
Relations
- Effective Date
- 08-May-2018
- Effective Date
- 09-Apr-2024
- Effective Date
- 22-Dec-2020
Overview
EN 50121-4:2016/A1:2019 (CLC) is the European standard that defines electromagnetic compatibility (EMC) requirements for signalling and telecommunications (S&T) apparatus installed inside the railway environment. It specifies limits for emission and immunity and gives performance criteria for S&T equipment - including associated power-supply systems - that could interfere with other railway apparatus or increase total railway emissions and cause electromagnetic interference (EMI) outside the railway system. The standard covers the frequency range DC to 400 GHz and is published as an amendment to EN 50121-4:2016 (A1:2019).
Key Topics and Requirements
- Scope and applicability
- Applies to signalling and telecommunication apparatus installed inside the railway environment (not vehicle-mounted or substation-connected equipment).
- Vehicle-mounted S&T: see EN 50121-3-2:2016; substation-connected S&T: see EN 50121-5:2016.
- Zones and equipment covered
- Vital equipment (e.g., interlocking, command & control).
- Apparatus located inside the 3 m zone.
- Ports of apparatus inside the 10 m zone with connection inside the 3 m zone.
- Ports inside the 10 m zone with cable length > 30 m.
- Other apparatus default to EN 61000-6-2.
- Emission and immunity limits
- Defines EMC limits and performance criteria to reduce the risk of EMI within and outside the railway environment.
- Intentional radiators (radio transmitters, transponders) are excluded from the standard’s radiated emission requirements; immunity exclusion bands follow the corresponding radio EMC standards.
- Compliance and testing
- Tests are defined only where requirements exist - no measurements required at frequencies without specified limits.
- Fault conditions are not taken into account; requirements address normal operating conditions.
- For products under EN 61000-3-x (harmonic/current/voltage) standards, those standards also apply.
- Regulatory relationship
- The amendment aligns the standard with Directive 2014/30/EU (EMC Directive) and CENELEC standardization requests.
Applications and Users
Who uses EN 50121-4:
- Railway signalling and telecom equipment manufacturers for product design and EMC compliance
- System integrators and installation engineers for on-site EMC mitigation
- EMC test laboratories performing emission and immunity testing to railway EMC criteria
- Procurement, certification bodies, and safety assessors ensuring interoperability and regulatory conformity
Practical uses:
- Designing S&T apparatus with acceptable emission/immunity performance
- Planning cable routing and port placement to meet zone rules (3 m / 10 m)
- Preparing test specifications and compliance evidence for rail EMC certification
- Reducing risk of EMI affecting critical railway control systems or external services
Related Standards
- EN 50121-1:2016 (general provisions for railway EMC)
- EN 50121-3-2:2016 (vehicle-mounted signalling & telecom)
- EN 50121-5:2016 (substation-connected apparatus)
- EN 61000-6-2 and EN 61000-3-2 / 3-3 / 3-11 / 3-12 (industrial EMC / supply-related standards)
Keywords: EN 50121-4, railway EMC, electromagnetic compatibility, signalling apparatus, telecommunications apparatus, EMI, emission and immunity.
Frequently Asked Questions
EN 50121-4:2016/A1:2019 is a amendment published by CLC. Its full title is "Railway applications - Electromagnetic compatibility - Part 4: Emission and immunity of the signalling and telecommunications apparatus". This standard covers: This European Standard applies to signalling and telecommunication apparatus that is installed inside the railway environment. Signalling and telecommunication apparatus mounted in vehicles is covered by EN 50121-3-2:2016, signalling and telecommunication apparatus installed inside the substation and connected to substation equipment is covered by EN 50121-5:2016. This European Standard specifies limits for emission and immunity and provides performance criteria for signalling and telecommunications (S&T) apparatus (including power supply systems belonging to S&T) which may interfere with other apparatus inside the railway environment, or increase the total emissions for the railway environment and so risk causing Electro-Magnetic Interference (EMI) to apparatus outside the railway system. The requirements specified in this standard apply for: — vital equipment such as interlocking or command and control; — apparatus inside the 3 m zone; — ports of apparatus inside the 10 m zone with connection inside the 3 m zone; — ports of apparatus inside the 10 m zone with cable length > 30 m. Other apparatus not covered by at least one of these given cases should be in compliance with EN 61000-6-2. If a port is intended to transmit or receive for the purpose of radio communication (intentional radiators, e.g. transponder systems), then the radiated emission requirement in this standard are not intended to be applicable to the intentional transmission from a radio-transmitter as defined by the ITU. Immunity limits do not apply in the exclusion bands as defined in the corresponding EMC related standard for radio equipment. The standard does not specify basic personal safety requirements for apparatus such as protection against electric shock, unsafe operation, insulation co-ordination and related dielectric tests. The requirements were developed for and are applicable to this set of apparatus when operating under normal conditions. Fault conditions of the apparatus have not been taken into account. The frequency range considered is from DC to 400 GHz. No measurements need to be performed at frequencies where no requirement is specified. For products in the scope of EN 61000-3-2, EN 61000-3-3, EN 61000-3-11 or EN 61000-3-12 the requirements of those standards also apply. These specific provisions are to be used in conjunction with the general provisions in EN 50121-1:2016. The immunity and emission levels do not of themselves guarantee that the integration of apparatus will necessarily be satisfactory. The standard cannot cover all the possible configurations of the apparatus, but the test levels are sufficient to achieve satisfactory EMC in the majority of cases.
This European Standard applies to signalling and telecommunication apparatus that is installed inside the railway environment. Signalling and telecommunication apparatus mounted in vehicles is covered by EN 50121-3-2:2016, signalling and telecommunication apparatus installed inside the substation and connected to substation equipment is covered by EN 50121-5:2016. This European Standard specifies limits for emission and immunity and provides performance criteria for signalling and telecommunications (S&T) apparatus (including power supply systems belonging to S&T) which may interfere with other apparatus inside the railway environment, or increase the total emissions for the railway environment and so risk causing Electro-Magnetic Interference (EMI) to apparatus outside the railway system. The requirements specified in this standard apply for: — vital equipment such as interlocking or command and control; — apparatus inside the 3 m zone; — ports of apparatus inside the 10 m zone with connection inside the 3 m zone; — ports of apparatus inside the 10 m zone with cable length > 30 m. Other apparatus not covered by at least one of these given cases should be in compliance with EN 61000-6-2. If a port is intended to transmit or receive for the purpose of radio communication (intentional radiators, e.g. transponder systems), then the radiated emission requirement in this standard are not intended to be applicable to the intentional transmission from a radio-transmitter as defined by the ITU. Immunity limits do not apply in the exclusion bands as defined in the corresponding EMC related standard for radio equipment. The standard does not specify basic personal safety requirements for apparatus such as protection against electric shock, unsafe operation, insulation co-ordination and related dielectric tests. The requirements were developed for and are applicable to this set of apparatus when operating under normal conditions. Fault conditions of the apparatus have not been taken into account. The frequency range considered is from DC to 400 GHz. No measurements need to be performed at frequencies where no requirement is specified. For products in the scope of EN 61000-3-2, EN 61000-3-3, EN 61000-3-11 or EN 61000-3-12 the requirements of those standards also apply. These specific provisions are to be used in conjunction with the general provisions in EN 50121-1:2016. The immunity and emission levels do not of themselves guarantee that the integration of apparatus will necessarily be satisfactory. The standard cannot cover all the possible configurations of the apparatus, but the test levels are sufficient to achieve satisfactory EMC in the majority of cases.
EN 50121-4:2016/A1:2019 is classified under the following ICS (International Classification for Standards) categories: 29.280 - Electric traction equipment; 33.100.01 - Electromagnetic compatibility in general; 45.020 - Railway engineering in general. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 50121-4:2016/A1:2019 has the following relationships with other standards: It is inter standard links to EN 50121-4:2016, prEN 50121-4:2025, FprEN 50121-4. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 50121-4:2016/A1:2019 is associated with the following European legislation: EU Directives/Regulations: 2014/30/EU; Standardization Mandates: M/522, M/552. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase EN 50121-4:2016/A1:2019 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CLC standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2019
Železniške naprave - Elektromagnetna združljivost - 4. del: Sevanje in odpornost
signalnih in telekomunikacijskih naprav
Railway applications - Electromagnetic compatibility - Part 4: Emission and immunity of
the signalling and telecommunications apparatus
Bahnanwendungen - Elektromagnetische Verträglichkeit - Teil 4: Störaussendungen und
Störfestigkeit von Signal- und Telekommunikationseinrichtungen
Applications ferroviaires - Compatibilité électromagnétique - Partie 4: Emission et
immunité des appareils de signalisation et de télécommunication
Ta slovenski standard je istoveten z: EN 50121-4:2016/A1:2019
ICS:
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
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 50121-4:2016/A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2019
ICS 29.280; 33.100.01; 45.020
English Version
Railway applications - Electromagnetic compatibility - Part 4:
Emission and immunity of the signalling and telecommunications
apparatus
Applications ferroviaires - Compatibilité électromagnétique - Bahnanwendungen - Elektromagnetische Verträglichkeit -
Partie 4: Emission et immunité des appareils de Teil 4: Störaussendungen und Störfestigkeit von Signal-
signalisation et de télécommunication und Telekommunikationseinrichtungen
This amendment A1 modifies the European Standard EN 50121-4:2016; it was approved by CENELEC on 2018-10-30. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, 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
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No.
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The EN 50121-4:2016/A1:2019 standard provides a comprehensive framework concerning the electromagnetic compatibility of signalling and telecommunications apparatus operating within the railway environment. Its scope is well-defined, focusing specifically on apparatus installed indoors, effectively excluding those mounted on vehicles or within substations, which are covered under different standards. This delineation ensures clarity and targeted application for stakeholders involved in railway signaling and telecommunications. One of the notable strengths of this standard is its detailed specification of emission and immunity limits, which are critical for preventing electromagnetic interference (EMI) among railway systems and adjacent technologies. By providing performance criteria, it addresses the safety and functionality of vital equipment, including interlocking systems and command and control apparatus, while also managing risks associated with the proximity of electrical ports and communication hardware. The standard's relevance is significantly underscored by its emphasis on real-world operating conditions, covering a wide frequency range from DC to 400 GHz and ensuring that manufacturers adhere to appropriate EMI guidelines. However, it is important to note that while the standard sets forth rigorous requirements for handling EMI, it does not account for fault conditions, which might be relevant for certain operational scenarios. This limitation may necessitate additional considerations for manufacturers when designing and testing their products. Furthermore, the document references interconnected standards such as EN 61000-3-2, EN 61000-3-3, EN 61000-3-11, and EN 61000-3-12, integrating the provisions with those specific standards to ensure a cohesive approach toward electromagnetic compatibility. This synergy enhances the overall framework and allows for a more comprehensive understanding of the EMC landscape within the railway sector. Through its thoroughness and focus, the EN 50121-4:2016/A1:2019 standard is a pivotal resource for ensuring the safe and effective functioning of signaling and telecommunications apparatus, addressing the challenges of EMI while promoting interoperability within the complex railway environment.
SIST EN 50121-4:2017/A1:2019は、鉄道環境内に設置された信号および通信装置に関する非常に重要な標準です。この欧州標準は、電磁両立性(EMC)における信号および通信装置の発生と免疫に焦点を当てており、鉄道システム内での相互干渉を防ぐための明確な基準を提供しています。 この標準の範囲は非常に広く、インターロックやコマンド・コントロールなどの重要装置や、3メートルゾーン内の装置、10メートルゾーン内でのポート接続に関する条件をカバーしています。これにより、鉄道環境内での他の装置に対する電磁干渉(EMI)のリスクを低減し、輸送の安全性と効率性を確保します。また、特定のポートがラジオ通信のために設計されている場合、国際電気通信連合(ITU)によって定義された意図的な放射に関する要件が適用されないことも明確にされています。 この標準の強みの一つは、運転中の正常条件下における操作に対する要件に基づき、信号および通信装置に必要な発生と免疫の限界を明示している点です。そのため、異なる構成での装置に対しても複雑な状況を考慮しなくても、ほとんどのケースで満足なEMCを実現できるとされています。さらに、周波数範囲がDCから400GHzまでカバーされ、特定の周波数に対して測定を行う必要がないという実用的なアプローチが採用されています。 この標準の関連性は、鉄道システムがますます電子機器に依存する現代において、EMCの重要性が増していることを反映しています。信号および通信装置が正常に機能するためには、適切なEMI対策が必要であり、SIST EN 50121-4はその指針を提供します。トンネルや駅などの密閉された環境内での通信の確保や、装置のトラブルを未然に防ぐための重要な基準として、さらに評価されていることにも注意が必要です。 このように、SIST EN 50121-4:2017/A1:2019は、信号および通信装置が鉄道環境内で適切に機能するために不可欠な標準であり、専門家や技術者にとって重要なリファレンスとなります。全体として、この標準は鉄道業界全体での電磁両立性の向上に寄与するものであり、その意義はますます大きくなっています。
Die EN 50121-4:2016/A1:2019 ist eine wesentliche europäische Norm, die sich auf die elektromagnetische Verträglichkeit im Bereich der Bahnanwendungen konzentriert, insbesondere auf die Emission und Immunität von Signalisierungs- und Telekommunikationsgeräten. Der Anwendungsbereich dieser Norm ist klar definiert und betrifft Geräte, die innerhalb der Eisenbahnumgebung installiert sind. Es ist wichtig zu beachten, dass Signalisierungs- und Telekommunikationsgeräte, die in Fahrzeugen montiert sind, unter die EN 50121-3-2:2016 fallen, während Geräte in Umspannwerken durch die EN 50121-5:2016 geregelt werden. Ein herausragendes Merkmal dieser Norm ist die detaillierte Festlegung von Grenzwerten für Emission und Immunität sowie die definierten Leistungsanforderungen für Signalisierungs- und Telekommunikationsgeräte (einschließlich der zugehörigen Stromversorgungsanlagen). Diese Anforderungen sind entscheidend, um sicherzustellen, dass diese Geräte keine elektromagnetischen Störungen (EMI) verursachen, die andere Geräte innerhalb der Bahnumgebung oder außerhalb des Bahnsystems beeinträchtigen könnten. Die Norm ist besonders relevant für kritische Geräte, wie beispielsweise für die Signalgebung oder die Steuerung, sowie für Apparate, die sich in sensiblen Zonen (3 m und 10 m) befinden. Ein weiterer Vorteil der EN 50121-4:2016/A1:2019 ist, dass sie spezifische Anforderungen auch für die Schnittstellen von Geräten und deren Verbindungen berücksichtigt, was zu einer erhöhten Sicherheit und Zuverlässigkeit im Betrieb führt. Die Festlegung von Frequenzbereichen von DC bis zu 400 GHz hebt die umfassende Anwendung der Norm in unterschiedlichen technologischen Kontexten hervor, wobei sie gleichzeitig präzise Vorgaben für die Messungen macht und definiert, dass keine Messungen bei nicht spezifizierten Frequenzen notwendig sind. Die Norm ist besonders wertvoll, da sie nicht nur die technischen Anforderungen abdeckt, sondern auch klare Vorgaben zur Koordination mit anderen relevanten Normen wie der EN 61000-6-2 bietet. Trotz der Komplexität im Bereich der elektromagnetischen Verträglichkeit stellt diese Norm sicher, dass die allgemeinen Bestimmungen aus der EN 50121-1:2016 in Kombination mit den spezifischen Vorgaben der EN 50121-4:2016/A1:2019 zu einem effektiven Schutz gegen EMI in der Eisenbahnumgebung führen. Wichtig ist auch zu betonen, dass die Norm zwar nicht alle möglichen Konfigurationen von Geräten abdecken kann, jedoch die festgelegten Testpegel in den meisten Fällen eine zufriedenstellende elektromagnetische Verträglichkeit gewährleisten. Die umfassenden Kriterien und Anforderungen machen die EN 50121-4:2016/A1:2019 zu einem unverzichtbaren Instrument für Hersteller und Betreiber von Signalisierungs- und Telekommunikationsapparaten im Eisenbahnbereich.
SIST EN 50121-4:2017/A1:2019 표준은 철도 응용 분야에서 전자기 호환성에 관한 중요한 지침을 제공합니다. 이 표준은 철도 환경 내부에 설치된 신호 및 통신 장치에 적용되며, 그 범위는 신호 및 통신 장치의 방출 및 내성을 다룹니다. 특히, 이 표준은 다양한 전자기 간섭(EMI) 위험을 감소시키기 위해 신호 및 통신 장치의 성능 기준과 방출 및 내성 한계를 명시합니다. 이 표준의 강점 중 하나는 철도 환경 내의 모든 장비가 상호 간섭이 없도록 보장하는 데 중점을 두고 있다는 점입니다. 특히, 중요한 장비와 3m 및 10m 존 내의 장치에 대한 요구 사항이 명확히 구분되어 있어, 철도 시스템과 외부 장치 간의 전자기 간섭을 방지하는 데 효과적입니다. 또한, 전기적 안전 문제를 제외하더라도 정상 작동 조건에서의 장비 성능을 보장하기 위해 필요한 테스트 수준을 설정하여 실질적인 적용 가능성을 높입니다. SIST EN 50121-4의 관련성은 철도 신호 및 통신 시스템이 매일 마주하는 다각적인 환경에서 전자기 간섭 문제를 해결하기 위한 강력한 기준을 제공하는 데 있습니다. 이 표준은 EN 61000 시리즈와 연계하여 사용할 수 있어, 다른 전자기 호환성 표준과의 통합적인 접근을 가능하게 하여 보다 효과적인 규정 준수를 도모합니다. 결과적으로, 이 표준은 철도 분야에서 신호 및 통신 장비의 안전성과 신뢰성을 높이는 데 필수적인 역할을 합니다.
La norme EN 50121-4:2016/A1:2019 est essentielle dans le domaine des applications ferroviaires, en se concentrant sur la compatibilité électromagnétique (CEM). Son champ d'application concerne les appareils de signalisation et de télécommunication installés dans l'environnement ferroviaire, ce qui en fait un document fondamental pour garantir une intégration efficace et sécurisée des systèmes S&T. Parmi ses points forts, la norme définit des limites claires pour les émissions et l'immunité, et propose des critères de performance pour ces appareils. Ceci est crucial pour prévenir les interférences électromagnétiques (EMI) qui pourraient affecter non seulement les systèmes à l'intérieur du réseau ferroviaire, mais également ceux à l'extérieur. La prise en compte de divers équipements vitaux, des zones spécifiques comme la zone des 3 m et des ports d'appareils, souligne la rigueur de la norme. La norme aborde également le fait que les appareils ne doivent pas nuire à l'environnement électromagnétique global, en augmentant les émissions au-delà des seuils acceptables. En spécifiant des exigences pour des cas particuliers, comme les ports ayant des connexions dans la zone des 3 m et des câbles de plus de 30 m, elle démontre sa pertinence dans des situations réelles d'exploitation ferroviaire. Un autre aspect positif de la norme est qu'elle intègre des références à d'autres standards, tels que l'EN 61000-6-2, garantissant ainsi une cohérence dans la conformité aux exigences de CEM. Bien que la norme ne couvre pas toutes les configurations potentielles des appareils, elle assure des niveaux d'émission et d'immunité suffisants pour la plupart des cas d'application, renforçant ainsi son importance pour les professionnels du secteur. En somme, EN 50121-4:2016/A1:2019 s'affirme comme une norme robuste et pertinente qui contribue de manière significative à l'amélioration de la compatibilité électromagnétique des équipements de signalisation et de télécommunication dans le domaine ferroviaire, renforçant ainsi la sécurité et l'efficacité des opérations ferroviaires.










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