Issued in 1975, this French postage stamp celebrates the Régie Autonome des Transports Parisiens (RATP), the public transport operator managing the Paris Metro and regional commuter lines. Designed by Bétemps, the stamp features a sleek blue-toned illustration of a regional metro train, symbolizing the modernization of urban and suburban transport systems in France. The minimalist, technical design reflects the industrial precision and innovation of the 1970s French transport network. Denominated at 1.00 franc, it honors efficient connectivity and metropolitan growth during the postwar period.