The MP 73 is a rubber tired variant of electric multiple units used on Paris's Métro system. The cars were delivered in 1974, when the RATP decided to convert Line 6 to rubber tyred pneumatic operation. The existing stock on Line 6 needed replacing at this time, and the line was converted to rubber tyred operation due to the lengthy open air viaduct sections of track, which generated much noise and vibration with older steel-wheeled rolling stock.
