Abstract: The beam-track interaction of rack railway on a simply supported beam bridge has an important impact on vehicle safety and structural stability. Based on the finite element theory, a space-coupling calculation model for the rack (rail) -sleeper-beam-pier is established. The beam-rail interaction of rack railway on a simply supported beam bridge under different loads is analyzed. The results show that the beam-track interaction of rack railway on a simply supported beam bridge is stronger than that of a continuous welded rail (CWR) on bridge. Under the longitudinal train load, the rail force, beam rail relative displacement, longitudinal force and displacement of pier top are 40% larger than those of the CWR on bridge. It is recommended to strengthen the restraint between track foundation and beam to increase the longitudinal resistance and prevent the crawling of the track under longitudinal force. The maximum stress of rack is less than its allowable stress so that the rack strength is not used as a control factor for structural design. It is recommended that the position of rack gap be staggered from the beam gap to effectively prevent the rack gap from changing too much.