The most noteworthy elements of the section are the viaduct over the Cuervo Regato (158 m), the viaduct over the Vía de la Plata (114 m) and the viaduct over the Tagus River (1,488 m). Undoubtedly, in this section the construction of the viaduct to cross the Tagus River, in an area where the river, due to the influence of the Alcántara reservoir, features a widening of the channel is particularly standout.
The Tajo viaduct has a total combined length of 1,488 m. The distribution of spans on the viaduct is influenced by the Tajo River, which is made by means of an arch of with a span measuring 324 m. However, the distribution of the 26 spans that make up the bridge is as follows: 45m + 9x60m + 57m + 6x54m + 57m + 7x60m + 45m.
The most emblematic element of this viaduct is the arch measuring 324 m in span between props, rising on its foundations a height of 70 m (height of the arch) and on the maximum level of reservoir a height greater than 80 m. The arch is formed by a rectangular hollow tapered section, caisson model with variable ridge. At the start of the arch it has a ridge of 4.00 m and a width of 12 m. In the core, the highest point of the arch, the section is reduced to a ridge of 3.50 m and 6.00 m wide.
The arch will exceed the current span record in Spain for viaducts of this type in rail. Therefore, it will be a reference-pint worldwide, placing the arch amongst the ones with the most sizeable spans in the world.