I cycled the Camino Frances from Logrono to Santiago in early May of this year. I now want to cycle the Camino Madrid in 2012 but wish to avoid the Madrid traffic and start in Cercedilla. Does anybody know if there is public transport between Madrid Airport and Cercedilla? If so, do they allow the carriage of bikes? If it is not possible to use public transport, is there anywhere near the airport where I can get my credencial stamped (starting point) without having to go into the city?