The train arrives into Aguas Calientes where private minibuses await passengers to escort them on the fifteen minute journey up to the citadel, avoiding the queues.  Upon arrival at the Machu Picchu entrance, passengers can go straight into the citadel as tickets will have been pre-purchased for all guests.  A guide will escort you around the citadel in small groups, pointing out the best of the ruins and recounting the history of this Inca settlement.