This document is the first official deliverable of the IFC Rail project, outlining railway requirements for extending IFC. It defines the IFC Rail Reference Process Map, key use cases and priorities, and general modelling requirements (alignment, spatial structure, etc.). It also includes Model View Definitions (MVDs) to guide implementation.

https://www.buildingsmart.org/wp-content/uploads/2019/10/RWR-IFC_Rail-Requirement_Analysis_Report_-_.pdf

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