A car connection system guides at least one supply cable between two cars and has a support part for mounting the supply cable. The support part has a separate connection point to which the supply cable can be electrically connected, and the support part is secured to an end closure. The car connection system is characterized in that the supply cable is configured as a spiral cable and extends about a cable longitudinal axis in a helical manner, the support part is rigid, and a clamping part is secured to the support part in order to relieve tension and mechanically support the supply cable.