The R2 Nord Line runs from Barcelona Airport to Maçanet-Massanes passing through Granollers Centre and Sant Celoni in the Montseny.
The stops in Barcelona are Barcelona-Sants, Barcelona-Passeig de Gràcia, Barcelona-Clot-Aragó and Barcelona-Sant Andreu Comtall.
For most visitors to Barcelona, the importance of this line is the Barcelona Airport connection.
Please remember that a Single Barcelona Metro Ticket or the T-10 are both valid for journeys between Barcelona City Centre and Barcelona El Prat Airport.
I have included the stops on the R2 Rodalies Nord line both as a graphic and text.
Please scroll down the page for information on train times on the R2 Aeroport-Barcelona-Maçanet-Massanes line.
As train times change seasonally, the best source of accurate timetables is the official RENFE Rodalies page.