This standard forms the basis for the generation and interpretation of railway specific functional structures during the life cycle of a railway vehicle or its assemblies. This standard also is applicable to specific vehicles like track machines, snow ploughs etc. The specific functions of their specific work process are not included in describing this standard; they have to be added for the individual project. EN 15380-4 also covers the requirements of the TSIs (Technical Specifications for Interoperability of Rolling stock) described in chapter 2.1 and the requirements of TR 50126-3 and completes these documents.