These documents describe the current situation of the interfaces for the existing but as well for the upcoming systems which are relevant for railway undertakings (RU).
Interfaces for a traffic operator, architecture v2 (pdf)
Interfaces for a traffic operator, technical description v2 (pdf)
Interface documentation (11/2018, zip)
Please notice that the documentation might have been updated since the package is uploaded here. It should be always ensured from Finrail that the latest versions of the interfaces are in use if new systems are being developed.