R2 (Rodalies de Catalunya)
The R2 is a line of Rodalies de Catalunya's Barcelona commuter rail service, operated by Renfe Operadora. It is a major north–south axis in the Barcelona metropolitan area, running from the southern limits of the province of Girona to the northern limits of the province of Tarragona, via Barcelona. North of Barcelona, the line uses the Barcelona–Cerbère railway, running inland through the Vallès Oriental region. South of Barcelona, it uses the conventional Madrid–Barcelona railway, running along the coast through the Garraf region. The R2 had an annual ridership of 33.6 million in 2016, achieving an average weekday ridership of 125,948 according to 2008 data, which makes it the busiest line of the Barcelona commuter rail service. All R2 trains use the Aragó Tunnel in Barcelona, where they share tracks with Rodalies de Catalunya's regional rail lines , , , and , calling at Sants and Passeig de Gràcia stations. The line originally had no branches, with and serving as its only southernmost and northernmost terminus, respectively. In 2009, it took over the service offered by Barcelona commuter rail service line , incorporating the branch lines to Barcelona–El Prat Airport and Barcelona's Estació de França. A new line scheme has been