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RailSystemModel 1.2

RSM 1.2 Essentials

RailSystemModel 1.2 has been published online as of January 10, 2022.


RailSystemModel 1.2 (RSM 1.2) is available in TTL format and in XMI format on the project’s RTM-RSM Gitlab, under “Technical Documentation”.


Please refer to the General Documentation.


See Licensing page.

RSM 1.2 Highlights

Base package

Base object and base property are a general pattern, bringing RSM closer to ontologies.

Quantities and units are made available, derived from SysML 1.2. In addition, some “shortcut classes” for usual quantities (Length, mass, …) are provided for convenience.

Specification, Observation, Prediction - sorted out and traced

New package “Observation & Measure” is derived from the SOSA/SSN (Semantic Sensor Network) ontology published by W3C with the participation of OGC.

In addition, this package addresses specifications (sets of requirements) and predictions in the same way.

This package paves the way to IOT and predictive maintenance, since at any time, nominal values, measured values and predicted values can be traced and compared.

Net Properties

Net properties, or line properties, sum up properties over sets of lines, or even entire networks. For instance, an area mixing 600mm and 760mm gauge tracks could bear the property “narrow gauge”.

 Net properties are meant to address such use cases as the Register of Infrastructure (RINF).

Infrastructure subsystems

Track, Signalling, and Energy are now provided.

They are kept lean, and have explicit relations with Expert Models such as EULYNX or IFC Rail.


Geometry package borrows from IFC Rail geometry, itself inspired by OGC.

Grafting onto RSM is very simple, as only three fundamental classes are concerned (Base Object, Linear Location, Spot Location).

Time Axis

Time Axis is about instants, intervals, and time reference systems.

All classes implement the essence of the W3C Time ontology.


Packages “Legal Entity” and “Weather” are available. Though apparently unrelated, they have some things in common:

  1. They describe concepts that are relevant to asset management and operations, paving the way to RSM extension over upper business capability levels;
  2. Both are based on publicly available ontologies.