Steel-aluminum composite contact rail

The utility model discloses a steel-aluminum composite contact rail which comprises an aluminum rail and a U-shaped steel belt composited with the aluminum rail. The aluminum rail comprises an aluminum rail body, mounting grooves and rail side edges, wherein the mounting grooves are formed in the two sides of the aluminum rail body and used for containing the U-shaped steel belt, and the rail side edges are arranged on the two sides of the aluminum rail body and form mounting grooves with the two side edges of the aluminum rail body. The aluminum rail body comprises a rail bottom located on the lower portion of the aluminum rail body and a rail body arranged on the upper portion of the rail bottom. The rail head is provided with a cavity in the extending direction of the contact rail. The suspension type air rail power supply system combines the characteristics of a suspension type air rail, adopts a compact design, is safe, reliable, economical and practical, has good performance, and can well meet the requi