First customer for the Bitrac was Ferrocarriles del Suroeste SA (Fesur) from Spain. It is an open access operator, founded in 2007. Both Grupo Alfonso Gallardo and Gea21 own 50% of the shares. Jerez de los Caballeros (Badajoz) is the home base of Fesur. In 2008 it got a license to operate its own rail services. CAF built nine Bitrac BITRAC CC35600 for Fesur, being the launching customer for this platform.
The homologation of the Bitrac locomoties was directed by rail operator Comsa. ADIF, the Spanish rail authority granted the Bitrac with a full approval in 2010. Early 2011, CAF delivered all nine machines to Fesur, but the company never operated them (see news for more information). All machines were returned to CAF, the last six of them arriving there on 21.02.2012. CVS (Compañía de Vagones del Sur) should have delivered 400 freight waggons to Fesur, but this contract was abandoned.