page_title: RailTopoModel
section_title: Structure
hierarchical_section_title: RailTopoModel / Structure
caption_attribution_description: Deutsch: Darstellung eines Stückes Eisenbahnstrucktur in unterschiedlichen Aggregationslevels im Rahmen des RailTopoModels English: A piece of railway structure, depicted in different levels of aggregation within the RailTopoModel Nederlands: Afbeelding van een stuk spoorweginfrastructure in verschillende aggregatieniveaus door het RailTopoModel
context_page_description: RailTopoModel is a systemic model for describing the topology-based railway infrastructure as needed by various applications. The RailTopoModel has been developed under patronage of the International Union of Railways and will be released as International Railway Standard 30100.
context_section_description: RailTopoModel is based on connexity graph theory and it is defined in terms of UML.
  Its emphasis lies on:
  Core elements — identification of all network components;
  Referencing — defining standards for addressing locations e.g. via geographical coordinates. The backbone of referencing in RailTopoModel is a linear referencing system;
  Topology — expressing the relations between the elements;
  Business — allowing to project objects and events onto the topology. These can be spots (e.g. a signal), linear entities ( e.g. a tunnel) or areas (e.g. a train station);
  Aggregation — allowing for the standardized and reversible aggregation e.g. to visualize the network in a broader scale. There are four predefined aggregation levels:
  nano: very large scale, depicting e.g. the interior of a switch
  micro: large scale, depicting e.g. switches and buffer stops connected by tracks
  meso: intermediate scale, depicting e.g. operation points and the number of tracks connecting them
  macro: small scale, depicting main operation points and the corridors between them
  The model allows defining as many levels as is deemed useful, while ensuring consistency of data between levels.
  Ideally, standardisation should grant for references and switches between aggregation levels being bijective and different applications being able to exchange data.
caption: A piece of railway infrastructure depicted in different aggregation levels
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