System of the electric traction system. It transforms and converts, by means of transformers and rectifiers, the high voltage alternating electric current, supplied by the production plants and transported along the line by means of power lines (Primary Lines), in the direct current supplying the Electric Traction Lines, or by contact . With the necessary characteristics compatible with the traction system adopted on the corresponding railway line. In particular the positive pole and the negative pole of the rectifiers are connected respectively to the contact lines and to the rails (return circuit). The Rectifier sub-stations are located along the railway line at a variable pace between 10 and 40 Km
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