The English iron railway Historical milestone · Monterrubio de la Demanda, Sierra de la Demanda, Burgos Image of Monterrubio de la Demanda, not of the place itself. The Sierra Company Limited obtained in 1896 the concession to lay a narrow-gauge line to bring the iron of these mines down to Burgos. It opened in 1901, proved ruinous, closed around 1910 and was dismantled in 1947. 1901 Photo: Estevoaei (CC BY-SA 4.0) What to see and do in Monterrubio de la Demanda