This route, also known as the Vía Negrín, was supposedly built in just forty days to supply Madrid when it was being besieged by Franco's troops. 

A strategic railway that had an ephemeral life, part of its route is now an escape route for the nearby capital and a peaceful itinerary through the agricultural region of southeast Madrid. This greenway was built by the Madrid Region.
 

Basic Facts
	13,42 Km
	Carabaña. Valdaracete. Estremera. Madrid. Madrid Region
	Trekkers, cyclists
	Asphalt
	Tajuña Greenway and Grand Tour of CiclaMadrid at Carabaña
	2 overpasses
	40.247953, -3.23006
	40.19092, -3.113831