The Pajares railway line that for 140 years has linked Asturias with the spanish inland is shown in this documentary as a continuous discovery of the passage of trains, residents of towns, railway workers, animals and surprising landscapes, all captured in the different seasons of the year and special light conditions. The possible disappearance of this hundred-year-old layout, replaced by the new underground tunnel, makes this work an essential piece of work, not only for its aesthetic values, but also because it treasures experiences of people, animals, machines and landscapes that we will never see again in that setting. incomparable of the Cantabrian mountain range.