I have train reservations from Atocha station to Pamplona on Sept 8 and will need to get to the Atocha station from the airport. I have seen several references to a C1 commuter train from the T4 terminal but when I search for the route on http://www.renfe.com/EN/viajeros/cercanias/madrid/index.html (Departure: Aeropuerto-T4, Destination: Atocha) , it says there are no services between these points?? Does anyone have recent, first-hand knowledge that they can share about this commuter rail trip?