A rail structure related to a track of a system adapted for electrically driving a vehicle along a roadway. The vehicle is provided with a current collector which is displaceable up and down and sideways in relation to the direction of transportation, in order to be brought into mechanical and electrical contact with elongated tracks positioned below the roadway and comprising a conductor adapted to be supplied with current and put under voltage. The rail structure comprises one or more tracks oriented parallel with external wall sections made of metal, and a partition separating the external wall sections and comprising an intermediate wall made of an electrically conductive material. Conductors are arranged in a lower portion of the tracks, respectively. The tracks comprise electrically insulating layers applied to surface portions facing each other of said wall sections and the partition, the insulating layers being coordinated with the lower portions and intended to support the conductors.