The foundation had to be designed having in mind that the underground commuter rail passes right through the lowest basement, having the building "ride" the tunnel.
There are currently twelve Cercanías systems in Spain: Asturias, Bilbao, Catalonia, Cádiz, Madrid, Málaga, Murcia/Alicante, Santander, San Sebastián, Seville, Valencia, and Zaragoza.
Both form part of the C-4a Cercanías line and can get to Sol and Atocha in half an hour.
Asamblea de Madrid Entrevías Station is a Cercanías station in Madrid city center.
Cercanías Bilbao follows the same patterns as other Cercanías networks in the country, as Cercanías Madrid or Cercanías Barcelona.