Another piece of news about trains for you today, also from September for 3 months - some journeys will be free for the 3 months and many more tickets will be half price.
The T-Casual integrated transport pass (10 trips) to travel between Vilanova i la Geltrú and Barcelona will have a 50% discount from September 1 until the end of the year. From €39.20 to €19.60..
Also the T-Usual card (unlimited trips in a month) as well as the Cercanías-only tickets (Bonotren of 10 trips, monthly and quarterly subscriptions) will be able to benefit from a price reduction by half, or free.
There el be no reduction on single/return trips, so all in all if you're visiting Barcelona during the 3 months from September it is better to buy a multi-ticket.