ELECTREN is specialized in energy systems for the railway: overhead contact line, traction substations and infrastructures for the transformation and distribution of electric energy; from the project conception, to its operation and maintenance. The high professional qualification of our human team and our own and specific machinery fleet, allow us to offer engineering, construction and maintenance solutions to any project of railway drive. In 2010, ELECTREN has fulfilled 20 years of activity, starting with the project of the transformation substations for the first high speed railway line in Spain: the AVE Madrid – Seville. During these years, ELECTREN has participated in the main railway developments in the country: both high speed and speed high, conventional lines, subway and streetcars or trams, becoming into a key supplier for the operators. Following its international expansion strategy, ELECTREN has been integrated in the markets of France, USA, Portugal, Poland and Morocco. References outside of Spain, are the works for the TGV line Paris-Lyon, for the substitution of contact wire, with a zero index incidence.