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 "D" (379)

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
Decommitment	EU Policy	Regulation	Regulation (EU, Euratom) 2024/2509 of the European Parliament and of the Council of 23 September 2024 on the financial rules applicable to the general budget of the Union (recast)
Decomposition	Freight	Glossary	Handbook of scenarios for assessing major chemical accident risks JRC106029 - Ed. 2017
Decryption	Withdrawn	TSI	Commission Regulation (EU) No 454/2011 of 5 May 2011 on the technical specification for interoperability relating to the subsystem ‘telematics applications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
DECT	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
Dedicated capacity	RNE Glossary	Glossary	RNE Glossary - NS_CID_Glossary_2025
Dedicated high-speed railway line	EU Policy	Glossary	Glossary for transport statistics - 6TH EDITION 2026	Latest release
Deep sea shipping	EU Policy	Glossary	Eurostat Transport Glossary on web release November 2024
Default value	ERTMS	Technical Document	ERTMS/ETCS - Glossary of Terms and Abbreviations - version : 4.0.0 - date 05/07/2023
Defect	SMS Safety Culture Human and Organisational Factor	ISO	ISO 9000:2015(en) Quality management systems — Fundamentals and vocabulary	Latest release
Defensive expenditures	EU Policy	Glossary	The Social Costs of Transport - February 1997
Deferred work	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
Deferred work	Entity in Charge of Maintenance	Application Guide	ISO 9879:2024(en) Railway applications — Rolling stock maintenance — Vocabulary	Latest release
Deferred work	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
Definitions related to rolling stock	Railway Tunnels	TSI	Commission Regulation (EU) No 1303/2014 of 18 November 2014 concerning the technical specification for interoperability relating to ‘safety in railway_tunnels’ of the rail system of the Europea
Degraded condition	Freight	Application Guide	Application_guide GUI/WAG TSI/2023 Version 4.0 8/12/2023
Degraded mode	Freight	Application Guide	Application_guide GUI/WAG TSI/2023 Version 4.0 8/12/2023
Degraded operation	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
Degree Celsius (°C)	EU Policy	Glossary	Glossary for transport statistics - 6TH EDITION 2026
Degree of filling	International Relations	Convention	Convention concerning International Carriage by Rail (COTIF) Appendix C – Regulations concerning the International Carriage of Dangerous Goods by Rail (RID)
Delay	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

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

Agreement
Application Guide
Certification Scheme
CIT Document
Convention
COTIF Document
Council Recommendation
Decision
Directive
ERA Technical Document
EU Technical Document
Glossary
Guide
International Agreement
ISO
Manual
Recommendation
Regulation
Sectorial Scheme
Technical Document
TSI
Website