The main objective of the present standard is to present the Reference Data Model for Public Transport, based on: — the Reference Data Model, EN 12896, known as Transmodel V5.1; — EN 28701:2012, Intelligent transport systems – Public transport – Identification of Fixed Objects in Public Transport (IFOPT), although note that this particular standard has been withdrawn as it is now included within Parts 1 and 2 of this standard (EN 12896-1:2016 and EN 12896-2:2016) following their successful publication; incorporating the requirements of: — EN 15531-1 to -3 and CEN/TS 15531-4 and -5: Public transport – Service interface for real-time information relating to public transport operations (SIRI); — CEN/TS 16614-1 and -2: Public transport – Network and Timetable Exchange (NeTEx), in particular the specific needs for long distance train operation.