Public transport - Service interface for real-time information relating to public transport operations - Part 2: Communications; English version EN 15531-2:2015— 131 стр.
Public transport - Service interface for real-time information relating to public transport operations - Part 1: Context and framework; English version EN 15531-1:2015— 124 стр.
Public transport - Service interface for real-time information relating to public transport operations - Part 3: Functional service interfaces; English version EN 15531-3:2015— 131 стр.