IFC 4.3.0.1 (IFC4X3) development

7.8.2.2 IfcRailwayPartTypeEnum

7.8.2.2.1 Semantic definition

The IfcRailwayPartTypeEnum defines the range of different types of railway part that can be specified.

The spatial structure of a railway is sub-divided into several elements for lateral, vertical and longitudinal decomposition:

  • TRACKSTRUCTURE is for the track part of the railway (vertical decomposition).
  • SUPERSTRUCTURE is for the upper part of the railway (vertical decomposition).
  • LINESIDESTRUCTURE is for the lateral part of the railway (lateral decomposition).
Railway vertical and lateral spatial decomposition
Figure 7.8.2.2.A — Railway decomposition

The subpart of the railway is generally either a IfcFacilityPartCommonTypeEnum BELOWGROUND (non constructed ground) or SUBSTRUCTURE (constructed ground).

TRACKSTRUCTURE could have longitudinal decomposition based on track specificities:

Railway vertical and lateral spatial decomposition
Figure 7.8.2.2.B — Track longitudinal decomposition

More generic longitudinal subdivision is provided for LINESIDESTRUCTURE with LINESIDESTRUCTUREPART value if needed.

7.8.2.2.2 Type values

Type Description
DILATATIONSUPERSTRUCTURE

The dilatation superstructure is one specific type of the track structure. It does not contain any plain-track or turnout panel.

LINESIDESTRUCTURE

A spatial structure element that contains the elements of the railway that are not in or over the tracks, hence line-side.

LINESIDESTRUCTUREPART

A railway line side structure part is a longitudinal decomposition of railway lineside structure in more managable volume for engineering purposes.

PLAINTRACKSUPERSTRUCTURE

The plain-track superstructure is one specific type of the track structure. It does not contain any turnout panel or dilatation panel.

SUPERSTRUCTURE

A spatial structure element that contains elements that are positioned over the tracks, such as catenaries.

TRACKSTRUCTURE

A spatial structure element that contains track-related elements.

TRACKSTRUCTUREPART

A track structure part refers to a segment of a track system. It usually has one of the following functions: plain-track, turnout-track, dilatation-track.

TURNOUTSUPERSTRUCTURE

The turnout superstructure is one specific type of the track structure. It does not contain any plain-track or dilatation panel.

USERDEFINED

User-defined type

NOTDEFINED

Undefined type.

Table 7.8.2.2.C

7.8.2.2.3 Formal representation

TYPE IfcRailwayPartTypeEnum = ENUMERATION OF
	(DILATATIONSUPERSTRUCTURE
	,LINESIDESTRUCTURE
	,LINESIDESTRUCTUREPART
	,PLAINTRACKSUPERSTRUCTURE
	,SUPERSTRUCTURE
	,TRACKSTRUCTURE
	,TRACKSTRUCTUREPART
	,TURNOUTSUPERSTRUCTURE
	,USERDEFINED
	,NOTDEFINED);
END_TYPE;

7.8.2.2.4 References

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