ERA vocabulary is an ontology defined by the European Union Agency for Railways (ERA) to describe the concepts and relationships related to the European railway infrastructure and the vehicles authorized to operate over it. The infrastructure portion contains the Implementation layer that represents the railway network as a number of operational points (OPs) connected with sections of line (SoLs), describing the following structural subsystems of the Union rail system: the infrastructure subsystem, the energy subsystem, the trackside control-command and signalling subsystem. It also contains the Topological layer where the network topological concepts are defined. The Railway Vehicle types portion contains the route compatibility check-related technical characteristics of vehicle types.
The author of ERA vocabulary is ERA and it is published by the Publications Office of the European Union on the EU Vocabularies website.