During the second half of the 20th century, Renfe operated several services on all the Iberian-gague lines and circulated as suburban trains.

[2] This changed in the 80s when the company began plans to create a defined and organised service, which was inaugurated in 1989.

[3][4] At first they were divided into C-1 (Puente de los Fierros-Gijón), C-2 (Oviedo-El Entrego), C-3 (Trubia-Oviedo) and C-4 (Oviedo-Avilés) services.

[5][6][7] Nevertheless, in 1999, as part of a urbanistic project called the Green Belt, the Fuso de la Reina branch to Oviedo was closed and the former iberian-gauge C-3 line (Oviedo-Trubia railway line) was converted into narrow-gauge.

[13] (Conecta) (Regular) The following graph shows the number of tickets validated per year.