ERA Railway Terminology Collection

Last updated: 12 March 2026

The ERA Railway Terminology Collection gathers terms and abbreviations that are contained in the EU legal framework for railway, technical documents produced by bodies which are engaged in the development of important evolution in the railway system and other relevant glossaries.

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Starting with "E" (738)

Disclaimer
ERA Railway Terminology Collection is a consultation tool, developed to support the sharing of information through the actors involved in running the Single European Railway Area (SERA). The responsibility for the correctness, completeness, accuracy, or reliability of the information in ERA RTC lays upon the authors of the definitions, as they derive from reference documents having their own preparation and approval flow. Users cannot call ERA liable for the use they make of the content. Please consider that when the collection is exported (.csv) and then printed or converted, it becomes uncontrolled.
Term	Context	Document Type	Origin document
Energy efficiency first	International Relations	Regulation	Regulation (EU) 2021/1153 of the European Parliament and of the Council of 7 July 2021 establishing the Connecting Europe Facility and repealing Regulations (EU) No 1316/2013 and (EU) No 283/2014
Energy supply system (Voltage and frequency)	Infrastructure	Regulation	Commission Implementing Regulation (EU) 2019/777 of 16 May 2019 on the common specifications for the register of railway infrastructure and repealing Implementing Decision 2014/880/EU
Engagement	SMS Safety Culture Human and Organisational Factor	ISO	ISO 9000:2015(en) Quality management systems — Fundamentals and vocabulary	Latest release
Engine	ERTMS	Technical Document	ERTMS/ETCS - Glossary of Terms and Abbreviations - version : 4.0.0 - date 05/07/2023
Engine Orientation	ERTMS	Technical Document	ERTMS/ETCS - Glossary of Terms and Abbreviations - version : 4.0.0 - date 05/07/2023
ENIAC	EU Policy	EU Technical Document	Technical document from the Publications Office of the European Union - ‘Style guide’ Coordination Interinstitutional Style Guide - version on 19.04.2022
ENIM	RNE Glossary	Glossary	RNE Glossary - NS_CID_Glossary_2025
ENISA	EU Policy	EU Technical Document	Technical document from the Publications Office of the European Union - ‘Style guide’ Coordination Interinstitutional Style Guide - version on 19.04.2022
ENQ	International Standard	EU Technical Document	CEN CENELEC ABBRAVIATION ACRONYM 2025
ENS	International Standard	EU Technical Document	CEN CENELEC ABBRAVIATION ACRONYM 2025
ENS CC	International Standard	EU Technical Document	CEN CENELEC ABBRAVIATION ACRONYM 2025
Enterprise	Telematics Applications for Passenger and Freight Services	Regulation	Regulation (EU) 2023/2854 of the European Parliament and of the Council of 13 December 2023 on harmonised rules on fair access to and use of data and amending Regulation (EU) 2017/2394 and Directive (EU) 2020/1828	Latest release
Enterprise	International Relations	Convention	Convention concerning International Carriage by Rail (COTIF) Appendix C – Regulations concerning the International Carriage of Dangerous Goods by Rail (RID)
Enterprise	Data Protection	Regulation	Regulation (EU) 2016/679 of the European Parliament and of the Council of 27 April 2016 on the protection of natural persons with regard to the processing of personal data and on the free movement of such data, and repealing Directive 95/46/EC
Entity	Withdrawn	Application Guide	TAP TSI Annex B.51 Tariff application_guide - version 1.0 of 06/12/2013	Latest release
Entity	Withdrawn	Application Guide	TAP TSI Annex B.52 Reservation application_guide - version 1.0 of 06/12/2013	Latest release
Entity	Security	Directive	Directive (EU) 2022/2555 of the European Parliament and of the Council of 14 December 2022 on measures for a high common level of cybersecurity across the Union, amending Regulation (EU) No 910/2014 and Directive (EU) 2018/1972, and repealing Directive (EU) 2016/1148 (NIS 2 Directive)
Entity in charge of maintenance (ECM)	Entity in Charge of Maintenance	Certification Scheme	Certification scheme for ECM and outsourced maintenance functions under Regulation (EU) 2019/779
Entity in charge of maintenance (ECM)	International Relations	Convention	Convention concerning International Carriage by Rail (COTIF) Appendix C – Regulations concerning the International Carriage of Dangerous Goods by Rail (RID)
Entity in charge of maintenance (ECM)	Interoperability	Directive	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 (recast)

Common Safety Method
Conformity Assessment
Control-Command and Signalling
Data Protection
Energy
Entity in Charge of Maintenance
ERTMS
EU Policy
Freight
Infrastructure
International Relations
International Standard
Interoperability
Noise
Operation
Persons with Reduced Mobility
Railway Tunnels
Registers
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RNE Glossary
Safety / SSC-SA
Security
SERA_EU Transport
Single Market Mutual Recognition Conformity Assessment
SMS Safety Culture Human and Organisational Factor
Telematics Applications for Passenger and Freight Services
Vehicles / VA
Withdrawn

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