Changes

Take a Renfe train on the R2 or R2 Nord line, direction: Granollers Centre (R2) or Macanet-Massanes (R2 Nord). Get off at station ''Montcada i Reixac''. (This train Train will take you about 20 minutes and costs €2,20 (2018)). Exit the train station to the left, through the second exit in the direction of the train. Walk under the railways and pass through the station building. At the other side you will find yourself at a small shopping district with a one way street. Follow it to the right. Pass the church, traffic lights, and cross the pedestrian bridge. Once over the bridge, turn left and follow the fenced in school playground around to the right. You should now see the motorway above you and parking below the motorway. Continue following the motorway until you see the road dip down and to the right under the railroad. Go under the bridge. Up ahead and to your left you will see a very broken vertical turnstile and a sign saying "forbidden" (see a picture here: http://imgur.com/MLxJc29). Ignore the sign and follow the foot path to the right, to the service road along the motorway. This service road goes right into the back of a Gasolinera Galp Montcada Norte petrol station.

Also you can get to same petrol station by metro L11till L11 till stop Torre Baró | Vallbona + 3 km walk next to river to to Montcada district and find a train stop ''Montcada i Reixac''. Than follow directions as above.