The tunnel will allow services serving northern cities to travel non-stop or with a stop through Madrid and onward to southern cities (or vice versa), without the driver having to change ends or bypass Madrid, a valuable source of passengers: currently, someone wanting to travel from Valladolid to Málaga, for instance, must travel from Valladolid Campo Grande station to Madrid Chamartín station before taking a Cercanías service to Atocha; then finally taking an onward train to Málaga.