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I did a search "train Biarritz to stjpdp" and got a rail europe website. Booked online for about 12us.
I got a code to enter into a ticket machine at the station to secure my ticket on arrival at the station, simple (I hope).
This site is run by Ivar at in Santiago de Compostela.
This site participates in the Amazon Affiliate program, designed to provide a means for Ivar to earn fees by linking to Amazon