Any resort between Barcelona and Blanes has a station in the town. Once you go North of Blanes the railway line heads inland and you have to get a bus to the resorts from the station. In many resorts the station is just behind the beach. In Blanes it is at the back of the town about a 30 minute walk to the seafront.

Calella you can also get the train from the resort cost €6.40 return.

These sites might help you.

http://horarios.renfe.es/hir/ingles.html
http://www.euroresidentes.com/resitravel_rail.html
http://www.travelinginspain.com/train.html