With its extensive use of Long/Continuously Welded Rails (LWR/CWR) in all types of rail transit systems, it is much important to discuss that the longitudinal movement of a bridge structure supporting CWR relative to that track results in interactive forces being induced in track and structural components. The movement may develop from differential temperature effects of rail and structure, dynamic load of vehicle, structural properties, substructure behavior or other factors. The overall interaction will be focused in this paper and the additional forces due to RSI to be presumed at the initial stage of bridge analysis will be discussed. A non - linear bridge model with interaction springs is modeled in relevant software. The effect due to temperature variation and train loads are analyzed. The rail is checked for permissible tensile and compressive stresses, deck end rotations and other permissible limits due to RSI effects are also checked. Also the additional forces in the bridge structures due to RSI are showcased. © Research India Publications.