Madrid – Valladolid line

Characteristics of the line


The route

The route begins on the present Madrid-Burgos corridor, running parallel to the M-607 highway until it reaches the municipal area of Tres Cantos. There, it crosses a wide streambed on the El Salobral viaduct and enters the San Pedro tunnel, which is approximately 9,000 m. long.

This tunnel ends in the municipality of Soto del Real, where the route turns northwest, arriving at the mountain massif of the Sierra de Guadarrama, which is traversed by means of the tunnel of the same name. The route continues until reaching the area to the south of the city of Segovia.

From Segovia it continues along the C-605 highway corridor through Santa María la Real de Nieva, where it crosses over the Segovia-Medina line.

After the Olmedo bypass to the southeast of the city, the route turns northward, connecting with the Madrid-Hendaye line (at mileage point 227/000), near Valdestillas. From here the route continues northward toward the city of Valladolid.

High-speed parameters

  • Standard roadbed width: 16 m
  • International/UIC-gauge (1,435 mm) double track
  • Gentle gradients (exceptionally, a maximum gradient of 20 thousandths per meter is attained)
  • Speeds of up to 350 km/h.
  • Unexceptional minimum radii: between 5,000 and 6,472 m


  • Viaducts: 18
  • Tunnels: 4
  • False tunnels: 5
  • Pergolas: 2
  • Underpasses: 48 (one under the M-607)
  • Overpasses: 54
  • Jacked boxes under the railway: 1


  • UIC-gauge 60 kg/m. rail.
  • Type A1-99 monolithic concrete sleepers on ballast, and Rheda 2000 system on slabs.
  • Track devices (switches, expansion mechanisms, etc…)


  • 2x25 kV aerial cables with alternating current.
  • Electric substations in Tres Cantos, Segovia and Olmedo.
  • Autotransformation centers located every 10 km.

Safety and communications systems

  • Electronic interlocks located in technical buildings constructed in Madrid-Chamartín, Tres Cantos, Soto del Real, Segovia, Garcillán, Nava de la Asunción, Olmedo, Hornillos, Valdestillas and Valladolid.
  • Telecommunication land lines.
  • GSM-R mobile telecommunications.
  • Detection and safety: fallen objects, dragged objects, fire, meteorological phenomena, hotboxes, tunnel air flow, vertical impact and pantograph dynamics.
  • Integration of all the systems into the Atocha Regulation and Control Center.


  • 3 Passing loops and parking positions (PAET in Spanish), in Soto del Real, Garcillán and Olmedo.
  • 4 reversible working positions, in Tres Cantos, Nava de la Asunción, Valdestillas and Río Duero.


Three gauge converters have been installed, in Madrid Chamartín, Valdestillas and Valladolid. The latter two make possible the connection of the high-speed Madrid-Segovia-Valladolid line
with the Iberian-gauge line (Madrid-Hendaye).

The gauge converters are made up of a series of devices that permit gauge changes for trains equipped with variable gauge axles.

They are called “dual” converters because they are equipped with one Talgo-type platform and another for Caf. They can alternate their positions depending on the mechanism installed on each variable gauge train, thanks to a mechanical and hydraulic system.

Equipping the converter with both technologies minimizes the use of space, bypasses, tracks, electrification, etc., with a notable reduction in the global costs and the land necessary for its construction.

Both the converter at Chamartín and that of Valdestillas have a new automatic dual gauge conversion system, with horizontal conversion from the Talgo and Caf technology platforms that allows a significant reduction in operation time and increases reliability.

Madrid Chamartín gauge converter

This converter connects international-gauge tracks with the confluence of Iberian-gauge tracks at the station.

Valdestillas dual gauge converter

This dual gauge converter was installed on a 1.9 km stretch and can admit vehicles over 500 meters long.

Valladolid - Campo Grande dual gauge converter

This converter, which has vertical displacement, is located between the Valladolid-Campo Grande station and the Valladolid-Universidad stop, specifically at mileage point 249/574 on the Madrid-Hendaye railway line, near the San Isidro Street underpass. The device will enable the connection between the Madrid-Segovia-Valladolid high-speed line and that of the Iberian-gauge Madrid-Hendaye line.
It will be equipped with a new automatic dual gauge conversion system, with horizontal conversion from the Talgo and Caf technology platforms that allows a significant reduction in operation time and increases reliability.


One of Adif’s primary concerns is the environment. This is why it dedicates 6.7% of the high-speed line construction budget to guaranteeing its integration into the landscape, assuring compliance with the Environmental Impact Statements (EIS), and making voluntary improvements to the surrounding areas.

The high-speed line construction work meets the recommendations of the Environmental Impact Statement and the Red Natura 2000. Ongoing contact has been maintained with the Regional Environmental Ministry of the Castile-León regional government and with the Spanish Ornithology Society (SEO is the Spanish acronym).

In the case of the high-speed line Madrid-Segovia-Valladolid, environmentally-friendly actions are centered on the installation of:

  • Stone cairns at the mouths of drainage devices.
  • Concrete or wood sleeper escape ramps.
  • Escape hatches.
  • Ridges to permit birds of the steppes to take off (bustards).
  • Viaduct integration (fauna throughways).
  • Landscape integration treatments: hydroseedings, planting and organic coconut blankets.
  • Fauna overpasses protected with topsoil, osier or wood screens.

More specifically, the number of trees (oak, ash, stone pines…) and bushes (broom, blackthorn…) has been considerably increased.

Plus, areas for the shelter and breeding of rabbits have been installed, both to increase their population and to protect the Iberian imperial eagle, whose primary food source is the rabbit.

Among other environmental measures, the building method thought up and employed to raise the Arroyo del Valle Viaduct must be highlighted.


San Pedro Tunnels

Exceeded only by the Pajares and Guadarrama tunnels, these are the third longest in Spain, being longer than those built in Perthus and Abdalajis.

There are two parallel tubes, each 8.5 km long with a single track.

Arroyo del Valle Viaduct

This is the line’s primary viaduct, and it is the longest continuous-deck viaduct in Europe.

The viaduct’s singularity resides fundamentally in its slender lineal design, which favors its integration into the landscape; in the building technique applied, new in Spain, and in the exceptionally environmentally-friendly measures developed for its construction.

It is found in beautiful natural surroundings between Soto del Real and Miraflores de la Sierra.

It is 1,755 m long, distributed over 27 openings, with 66 m. spans and a maximum pylon height of 80 m.

The central opening of the Arroyo del Valle viaduct has a 132 m. span and a 49 m. arch rise, with a total arch weight of 2,500 tons.

Guadarrama tunnels

This is the fourth longest tunnel in Europe and the fifth longest in the world. Each of the two tubes that comprise it is over 28.4 kilometers long.

The tunnel route runs from the municipal area of Miraflores de la Sierra (Madrid) to the outskirts of Segovia (the city.)

The boring work was completed in 2005, and up to 4,000 people worked together in its construction.


Fuencarral - Miraflores de la Sierra stretch

  • El Salobral viaduct (748 m.)
  • Majalahita viaduct: Very close to Guadarrama: (702 m.)
    Constructed with a method of pre-made voissoirs launched from the ends.

Miraflores – Segovia stretch

  • La Fuentecilla tunnel. Upon exiting Segovia (1,021 m.)
  • The two Arroyo del Vadillo viaducts (142 m.)
  • The viaduct over the Hontoria highway (136 m.)

Segovia – Valdestillas stretch

  • Six viaducts. The longest is the Perogordo viaduct, 798 m. long on the road out of Segovia over the N-110 highway, the Cordel de Paredones and the old Segovia - Medina del Campo railway.
  • Moros River viaduct
  • Tabladillo tunnel, 2,725 m. long; a double track tunnel with a 100 m2 free interior section.
  • Voltoya River viaduct with a length of 176 meters, located on the Coca – Ciruelos de Coca stretch.

Valdestillas – Duero River stretch

  • Three viaducts crossing the Adaja (150 m. construction), Cega (269 m.) and Duero (153 m.) rivers.