With the well known Renfe Class 333 locomotives having served for over 30 years the Spanish rail operator faced decisions as to their future.

[7] In summary, the engine, electronics and power transmission system are from General Motors, the other components are typical of an Alstom locomotive.

The replacement service began in March 2007 and ends when the construction of a true high speed line is completed.

[10] In 2006 a joint venture between Renfe and Vossloh, Erion, was created, dedicated to servicing and manufacture of rail equipment.

[11][12] This action has met with criticism from unions as it is part of the process of privatising the Spanish Railways.