[1] The project for the renovation of the suburban railway network of Asturias was presented in August 2000 by the Ministry of Development.
[4] During the construction of the tunnel, the Ministry of Development changed its criteria regarding the rest of the project's actions, deciding that it be extended to reach the Cabueñes area, thus doubling the length of the section.
The complete definition of the second phase ended in 2009, with the remaining cost estimated at €360 million, with an action along 7 km between the Humedal and Cabueñes.
[5] The development of this second part began in 2011 through public-private financing, and involves the provisional diversion of the FEVE lines from the Humedal station to the provisional station of Sanz Crespo, which was started in February 2011.
The project also consists of improvements at other railway stations in Asturias, such as those located in Avilés.