Dev:How To Reference Infrastructure

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This article explains basic concepts of referencing infrastructure within the timetable subschema.

Dieser Artikel erklärt die Grundlagen, wie man innerhalb des Timetable-Subschemas Infrastruktur referenziert.

How to reference infrastructure / Referenzierung von Infrastruktur

A train part is described as passing a sequence of several operation or control points <ocpTT>. The related <ocp> elements and the used parts of <track>s inbetween are part of the <infrastructure>. The way from one <ocpTT> to the next is described in the sub-element <sectionTT>. Part of the description is the reference to the infrastructure <track> element by using <trackRef>.
Ein Zuglauf <trainPart> besteht im Wesentlichen aus der Abfolge der befahrenen Betriebsstellen <ocpTT>. Diese Betriebsstellen und die dazwischen liegenden befahrenen Gleise sind Teil der Infrastruktur. Der Weg bis zur nächsten angegebenen Betriebstelle wird im Unterelement <sectionTT> näher beschrieben. Dazu gehört auch die Angabe der konkret befahrenen Gleise als Referenz <trackRef> auf die jeweiligen Infrastrukturelemente.

Different usages of the infrastructure schema

The macroscopic infrastructure model considers tracks as a connection between ocps. This model is typical for a timetable view.

The microscopic infrastructure model considers tracks as a connection between switches. This model is the preferred one for a simulation tool or a signal box view of the infrastructure.

To create unique references from a train part to the infrastructure with these two models, it is assumed that

  • in the macroscopic model in railML there are 'long' tracks, i. e. the tracks cross several switches, junctions, or OCPs.
  • in the microscopic model in railML there are 'short' tracks, i. e. the tracks are only defined between two switches or junctions but do not cross any switch or junction.

How to define it with railML?

Example 1

If the infrastructure is used in the macroscopic way, only one <trackRef> element should be used for an <ocpTT>.

Example 2

If the infrastructure is used in the microscopic way, you will have to list all tracks (from switch to switch) as <trackRef> elements until you reach a track which contains a <crossSection> element related to the next <ocpTT>.

To list more than one track at <trackRef> shall only be done if the tracks are 'short', i. e. if they are defined between two switches or junctions only but not longer. This secures the description of a train part's route to be unique.