RATP: Continues to grow strong, smart and ambitious December 1, 2012 | TA/ TSO Focus The Régie Autonome des Transports Parisiens, also known as the RATP Group, is a state-owned public transport operator headquartered in Paris, France. The RATP Group is the world's fifth largest public... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password