The ALCO RSD-39 was a six axle, low axle weight diesel-electric locomotive built by ALCO and under license by Euskalduna.

Fifty units were built for Alco between 1965 and 1967 for Renfe, forming part of Renfe Class 313. Other versions were exported to railways in South America.

Original buyers Railroad Quantity Road numbers NotesFC Guayaquil a Quito10160-169FC del Sur del Perú11350-360ENAFER3433-435ENAFER Red Sur-Oriente2484-485RenfeSources:501301-1350Originally as Renfe Class 1300, later reclassified Renfe Class 313exported to Portugal (CP 1320) and to Argentina, for Trenes de Buenos Aires (TBA)

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