Q: I  have read in your site a lot about T10 card and understood that we can buy T10 at the entrance of RENFE station at the airport. My question is can I buy T10 ticket by credit card either at the ticket office or through ticket machines?

A: You can purchase the T10 travel ticket with a credit card both at the ticket vending machines and at the manned ticket office.  As a matter of precaution I would consider taking both cash and credit card. Sometimes I´ve found the automatic vending machines won´t function with a credit card for no apparant reason.  Some metro entrances do not have a manned ticket office in which case you will have to use a automatic vending machine.  If you purchase your ticket at a manned ticket office remember to have your photographic identification handy because all credit card purchases in Spain, where a cashier is undertaking the transaction, must be accompanied with official photographic ID e.g. Passport.