The Sierra Railway, which was designed to run between Jerez de la Frontera and Almargen, was a dream project, at the beginning of the 20th century, for generations of Cadiz and Sevillians who lived in the lands surrounding the Guadalete and the higher-up lands of Olvera. The military also wanted the construction of a railway that would link their bases in Cartagena and Cádiz. Being fully blessed, construction began quickly under the leadership of someone born in this region, General Primo de Rivera, who was from Jerez.

The Spanish Civil War brought construction to a halt. Once the war was over, the harsh post-war period was not the best context to resume this difficult construction. This brings us to the mid-1960s, when a World Bank report put an end to construction once and for all, even though the stations, viaducts and tunnels had been completed and all that remained was laying down the tracks.

In the case this vast project covering 119 km, only the 21-km section from Jerez to the Jédula sugar refinery was ever operational, and only for transporting beetroot and sugar. The tracks were laid as far as Arcos de la Frontera, but only test trains ever ran along them. Even a family of railway workers lived in the station buildings, as if waiting for decades for the arrival of a train that never came. Another of the paradoxes of this line was that its route was affected by the flood zone of the Bornos Reservoir, which was inaugurated in 1961. This meant that the Guadalquivir Hydrographic Confederation was forced to build a new route at a higher level, outside the part affected by the waters. Naturally, this 2-km route, which featured a large tunnel, did not enter into service either.