Hi, I have a 1 month Senior Interrail pass for the first time and my country of permanent residence is Spain. I am about to travel from my home in Malaga to London, via Madrid, Barcelona and Paris and that is all booked and sorted. However on my return trip I am taking the overnight Brittany Ferries from Plymouth to Santander, then onwards by train to Malaga via Madrid, all in the same afternoon.
My question is this - does Santander count as a border point for entry into Spain, therefore allowing me to use the Interrail for 1 continous journey onwards on that day of arrival, or would it be considered an internal Spanish trip and so not valid?
Thanks