The Greenway runs along an infrastructure which leads into the mountain 18 times. The Jara Greenway is special in many respects, among which is the fact that it ends in a tunnel, and the fact that the highest part of the Greenway is the one in which there are most tunnels. 

The most outstanding tunnel is tunnel number 9, at km 30, just after leaving the Nava-Fuentes station to the left, in the direction of Santa Quiteria, which is the longest tunnel in the route – more than 730 m long. 

Tunnels 4, 5 y 13 are much shorter at about 250 me (at kms 25, 26 y 38, respectively), si even though the curvature of some of their layouts can give rise to a feeling of deep darkness.