Abstract: In order to meet the demand of low-smoke halogen-free B₁ flame retardant for rail transit cables, a comprehensive discussion was conducted on structural design, material selection, and manufacturing process of low-smoke halogen-free B₁ flame retardant transponder data transmission cables for rail transit. And the reliability of cable performance was verified through calculation examples and performance tests, which could provide reference for design of low-smoke halogen-free B₁ flame retardant transponder data transmission cables for rail transit.