ERA Railway Terminology visual v0 featured

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 "A" (434)

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
Authorising Entity	Control-Command and Signalling	ERA Technical Document	Guideline - Certification: Restrictions and added functions V1.0 of 18.06.2024
Authorising entity	Vehicles / VA	Application Guide	EVR Guidelines – application guide 013PPS1131-01 - V 8.0 on 11.12.2020
Authorising officer	EU Policy	Glossary	EU budget glossary - A list of the most common words and useful terms concerning the EU budget
Authorising train movements	Operation	TSI	Commission Implementing Regulation (EU) 2019/773 of 16 May 2019 on the technical specification for interoperability relating to the operation and traffic management subsystem of the rail system within the European Union and repealing Decision 2012/757/EU
Authorising train movements	RNE Glossary	Glossary	RNE Glossary - NS_CID_Glossary_2025
Automatic authentication	Energy	Regulation	Regulation (EU) 2023/1804 of the European Parliament and of the Council of 13 September 2023 on the deployment of alternative fuels infrastructure, and repealing Directive 2014/94/EU
Automatic coupling	Interoperability	Decision	Commission Decision of 30 November 2009 on the reference document referred to in Article 27(4) of Directive 2008/57/EC of the European Parliament and of the Council on the interoperability of the rail system within the Community. (2009/965/EC)
Automatic driving mode	ERTMS	Technical Document	ERTMS/ETCS - Glossary of Terms and Abbreviations - version : 4.0.0 - date 05/07/2023
Automatic dropping device required	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
Automatic Joining	ERTMS	Glossary	ERTMS/ATO Glossary - version 2 on 05.07.2023
Automatic Splitting	ERTMS	Glossary	ERTMS/ATO Glossary - version 2 on 05.07.2023
Automatic Train Operation	ERTMS	Glossary	ERTMS/ATO Glossary - version 2 on 05.07.2023
Automatic train protection	ERTMS	Technical Document	ERTMS/ETCS - Glossary of Terms and Abbreviations - version : 4.0.0 - date 05/07/2023
Automatic Turnback	ERTMS	Glossary	ERTMS/ATO Glossary - version 2 on 05.07.2023
Auxiliary	International Relations	COTIF Document	Uniform Rules concerning the Contract of Use of Infrastructure in International Rail Traffic (CUI - Appendix E to the Convention) applicable from 01.07.2015
AV	ERTMS	Glossary	ERTMS/ATO Glossary - version 2 on 05.07.2023
Availability	Withdrawn	TSI	Commission Regulation (EU) No 454/2011 of 5 May 2011 on the technical specification for interoperability relating to the subsystem ‘telematics applications for passenger services’ of the trans-European rail system	Latest release
Availability	ERTMS	Technical Document	ERTMS/ETCS - Glossary of Terms and Abbreviations - version : 4.0.0 - date 05/07/2023
Availability	International Standard	ISO	ISO 22163:2023(en) Railway applications — Railway quality management system — ISO 9001:2015 and specific requirements for application in the railway sector
Availability	SMS Safety Culture Human and Organisational Factor	ISO	ISO 22163:2023(en) Railway applications — Railway quality management system — ISO 9001:2015 and specific requirements for application in the railway sector	Latest release

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
Regulation
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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Application Guide
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Convention
COTIF Document
Council Recommendation
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ERA Technical Document
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International Agreement
ISO
Manual
Recommendation
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TSI
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