In reply to JimLondon:
You can catch a lift with the post man.
If you ask at the info centre at the train station they will tell you.
I caught it i think it goes from outside the restaurant on the right hand side as you come out of the train station.
It only goes as far as the nearest main town (can't remember the name) and then its about an hours walk up to Siurana or you could take your luck and thumb it.
You can get a taxi from the above mentioned town and should take about 20 mins.
Sorry if all this is a bit vague but it all i can remember.