Sants is main for international trains, so best is to take a train from Pl de Catalunya to Sants
you can do it by metro on blue line L5 or green line L3.
this is a site that explaines all very well
Here is a link which discusses ways to save on Renfe train travel by planning ahead and using their online booking:
Renfe may be hard to do a general search; sometimes you need to go to the "Cercanias/Rodalies" to see local, commuter lines. For more user friendly site see -
We used the night train to go to Madrid from Barcelona. Although the timing was great to leave the city in the evening and reach Madrid early in the morning, the train itself wasn't very comfortable. The whole journey takes about 9 hours and costs 46 Euros per person. Depending on the time and date, the prices may change. For busget travellers who want to discover Madrid as well as Barcelona, this could be a good option to utilise your time. I guess you can find a similar train from Madrid to Barcelona if you check the renfe website given below.
As I understood, trains could be the best option to head to daytrips from Barcelona. They are convenient and quite cheap. The one, not so far from Catalonia Square, train station is in Gracia street. Here you could take trains (RENFE) to Girona, Tarragona and other destinations.
Train from Girona to Barcelona took about 1,5 hours and the sale of ticket was about 9 euros one way.
Train to Tarragona took a bit more than 1 hour; the ticket price was approximately 7 euros.
The Eurail pass is the biggest scam going, imo. Its so much cheaper and easier to just buy you're tickets for the next city the day you arrive. I mean you're in the train station anyways so might as well.
I would travel back and forth from Sitges, Spain to Barcelona via the RENFE train. The train was located about 15 minutes (on foot) from my hotel and way incredibly convenient! Pretty cheap and fast, and it sure as heck beats renting a car in a city I was unfamiliar with!
Convenietly located near the Gothic Quarter is the central train station that provides departures for the rest of Europe. Some local excursionary trains also depart from here, but most of those are easier to catch at one of the metro stations. Barcelona is well served by trains of all sorts.
We used Renfe to go to Blanes(where we stayed) and Figueres(for Dali Museum) . Please be careful about the timetables and don't forget to take one from ticket offices.
to get to several towns or vilalges around Barcelona there is a system of trains of short distance traffic. From plaza Catalunya start two main lines, "Metro del Vall?s" and "Linia de Balmes" . Those trains are not part of the Metro, so you got to buy extra tickets, if you use e.g. the BCN-Card or some other kind of day or week ticket for busses and Metro. Am not sure about all prices, but to go to Terrassa, around 40 minutes away from plaza Catalunya, I paid 2,50 Euro. There are vending machines to buy your ticket, normally you get change as well.
RENFE stands for "Red Nacional de Ferrocarriles Espa?oles" or "National Network of Spanish Railroads". U can use them just to go from one city ot another and also, as in this case, to travel to the outskirts of the city.
For example, U must take the RENFE line number 5 to go to the Airport. From inside the city U can take a bus, taxi or metro to get to "Sant Estacions" and from here U must take the RENFE line number 5.