The railway from Calahorra to Arnedillo had a fairly turbulent history. At the beginning of the 1920s the rural district of Cidacos started to experience a process of industrialization which, combined with the fertility of its riverside lowlands, made the idea of building a railway to take the produce to market a very appealing one. Thus in 1920 the Sociedad de Ferrocarriles Eléctricos was commissioned to build and run a railway from Calahorra to Préjano.

In addition to the above mentioned cargoes, at Préjano the railway was also to load minerals arriving from a 5 km long mining spur. The section to Préjano was opened in 1924, although the first trains had already reached Autol two years previously.

In spite of the name of the railway company, the line was never in fact electrified, although electrification plans were submitted. When the company ran into difficulties in 1935 the service was suspended. In 1938, in the middle of the civil war, the State took over the management of the railway and work began to reopen the line. In 1942 service was re-established from Calahorra to Arnedo and in 1947 the railway was completed and trains ran as far as Arnedillo.

Twenty years later, now operated by FEVE (Spanish Narrow-Gauge Railways), the railway once again ran into serious difficulties and the line was finally closed in 1966. Nearly 30 years later the Arnedillo railway was news once again; in 1998 the Ministry of the Environment and the Regional Government of La Rioja refurbished the forgotten railway as a Greenway in 1998.