Ramal (Madrid Metro)
The Ramal Ópera–Príncipe Pío, also known simply as the Ramal (Spanish pronunciation: [raˈmal]) or line R, is the shortest line of the Madrid Metro. It is a 1.1-kilometre-long (0.68 mi) shuttle service, connecting the stations of Ópera and Príncipe Pío with no intermediate stops.