[citation needed]) was a class of 6 axle mainline diesel-electric locomotives built for Renfe by Euskalduna under license from Alco.

Alco's model number for the type was DL535S - RSD39 The locomotives were acquired by Renfe to replace steam engines on lines in Andalusia, La Mancha and Extremadura, and were designed to be able to operate on lines that required a low axle load.

[2] The fifty units were numbered 313–001 to 313–050;[1] 40 were constructed under license by Euskalduna, the remainder by Alco.

[1] The locomotives were initially supplied in yellow striped Renfe green livery, some units later received Renfe yellow grey after refurbishment.

for work at the CEPSA refinery La Rábida in Palos de la Frontera,[1][4][5] and four units (No.s 20, 41, 46 and 47) were acquired and regauged to 1,000 mm (3 ft 3+3⁄8 in) metre gauge for use by the railway of the Minero Siderúrgica de Ponferrada.