R3 (Rodalies de Catalunya)

The R3 is a line of Rodalies de Catalunya's Barcelona commuter rail service, operated by Renfe Operadora. It runs northwards from the Barcelona area to the French border town of Latour-de-Carol, passing through the Vallès Oriental, Osona and Ripollès regions. With a total line length of 165.9 km, it extends notably beyond the limits of the Barcelona metropolitan area, reaching the Pyrenees mountains. According to 2008 data, the line's average weekday ridership is 22,841.

R3 trains use the Meridiana Tunnel in Barcelona, where they share tracks with Barcelona commuter rail service lines, and , as well as Girona commuter rail service line  and regional rail line , calling at Sants, Plaça de Catalunya and Arc de Triomf stations. They run primarily on the Barcelona–Latour-de-Carol-Enveitg railway, using Latour-de-Carol-Enveitg as their northernmost terminus, and L'Hospitalet de Llobregat as its southern one.

Together with lines R1, and R4, the R3 (then simply numbered line 3) started services in 1989 as one of the first lines of the Cercanías commuter rail system for Barcelona, known as Rodalies Barcelona. In 2010, after the administration of the Barcelona commuter rail service was transferred to the Catalan government, the line was extended from its original northern terminus at Vic to Latour-de-Carol-Enveitg. The section north of Vic had not previously been considered part of the Barcelona commuter rail service; designated Ca5, the services running on it were part of Renfe Operadora's regional rail division in Catalonia. In the long-term future, it is projected that the R3 will be rerouted through the Aragó Tunnel in Barcelona. Furthermore, it is planned to be extended southwards to Castelldefels, thanks to the construction of a new branch line from Cornellà de Llobregat.

The R3 is the Barcelona commuter rail service line with the highest number of service incidents, and has been the recipient of much criticism from its users and local authorities. Minor delays occur constantly on the line, most of which can be attributed to the fact that it uses single-track infrastructure for almost all of its length. There have been calls for the conversion of the line's route to double track since the 1990s, especially on the Barcelona–Vic section.

List of stations
The following table lists the name of each station served by line R3 in order from south to north; the station's service pattern offered by R3 trains (excepting the semidirect trains, which only call at Vic, Ripoll and Puigcerdà stations north of Barcelona Sant Andreu Arenal); the transfers to other Rodalies de Catalunya lines, including both commuter and regional rail services; remarkable transfers to other transport systems; the municipality in which each station is located; and the fare zone each station belongs to according to the Autoritat del Transport Metropolità (ATM Àrea de Barcelona) fare-integrated public transport system and Rodalies de Catalunya's own fare zone system for Barcelona commuter rail service lines.