Arrival of the La Robla-Bilbao coal railway Historical milestone · Guardo, Alto Carrión, Palencia The narrow-gauge line from La Robla to Bilbao, opened in 1894 to carry the coal towards the Biscayan blast furnaces, triggered the development of the coalfield and made Guardo its head town. finales del siglo XIX Photo: Mentxuwiki (CC BY-SA 4.0) What to see and do in Guardo