The mining railway to Zaragoza Historical milestone · Utrillas, Cuencas Mineras, Teruel Between 1904 and 1966 a narrow-gauge line of one hundred and twenty-seven kilometres operated linking the coal basin with Zaragoza. Part of the original rolling stock is used today on the tourist train that runs through the mining installations. 1904-1966 Photo: B25es (CC BY-SA 4.0) What to see and do in Utrillas