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 "O" (248)

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
Obstacle-free route	Persons with Reduced Mobility	TSI	Commission Regulation (EU) No 1300/2014 of 18 November 2014 on the technical specifications for interoperability relating to accessibility of the Union's rail system for persons with disabilities and persons with reduced mobility.
OBU	ERTMS	Glossary	ERTMS Glossary
OBU	RNE Glossary	Glossary	RNE Glossary - NS_CID_Glossary_2025
OBU	ERTMS	Technical Document	ERTMS/ETCS - Glossary of Terms and Abbreviations - version : 4.0.0 - date 05/07/2023
OBU	Control-Command and Signalling	ERA Technical Document	Guideline - Certification: Restrictions and added functions V1.0 of 18.06.2024
OC	Infrastructure	Application Guide	Guide on the application of the common specifications of the register of Infrastructure - v. 3.1.0 on 31.03.2025
OCAS	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
OCC	Freight	Glossary	Transport of dangerous goods. Risks Management Framework. Framework glossary v. 1.0/2018
OCC	ERTMS	Glossary	ERTMS/ATO Glossary - version 2 on 05.07.2023
Occupational health and safety management system / OH&S management system	SMS Safety Culture Human and Organisational Factor	ISO	ISO 45001:2018(en) Occupational health and safety management systems — Requirements with guidance for use	Latest release
Occupational health and safety objective / OH&S objective	SMS Safety Culture Human and Organisational Factor	ISO	ISO 45001:2018(en) Occupational health and safety management systems — Requirements with guidance for use	Latest release
Occupational health and safety opportunity / OH&S opportunity	SMS Safety Culture Human and Organisational Factor	ISO	ISO 45001:2018(en) Occupational health and safety management systems — Requirements with guidance for use	Latest release
Occupational health and safety performance / OH&S performance	SMS Safety Culture Human and Organisational Factor	ISO	ISO 45001:2018(en) Occupational health and safety management systems — Requirements with guidance for use	Latest release
Occupational health and safety policy / OH&S policy	SMS Safety Culture Human and Organisational Factor	ISO	ISO 45001:2018(en) Occupational health and safety management systems — Requirements with guidance for use	Latest release
Occupational health and safety risk / OH&S risk	SMS Safety Culture Human and Organisational Factor	ISO	ISO 45001:2018(en) Occupational health and safety management systems — Requirements with guidance for use	Latest release
Occupied	ERTMS	Technical Document	ERTMS/ETCS - Glossary of Terms and Abbreviations - version : 4.0.0 - date 05/07/2023
Occurrence	Freight	Glossary	Transport of dangerous goods. Risks Management Framework. Framework glossary v. 1.0/2018
OCG	International Standard	EU Technical Document	CEN CENELEC ABBRAVIATION ACRONYM 2025
OCL	Interoperability	Application Guide	Application_guide GUI/TSI/2023 Version 1.0 20/12/2023Guide for the application of the Technical Specifications for Interoperability (TSIs)
OCL	Energy	TSI	Commission Regulation (EU) No 1301/2014 of 18 November 2014 on the technical specifications for interoperability relating to the energy subsystem of the rail system in the Union

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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