The running performance of train on Shiguo bridge is analyzed with energy random analysis theory for derailment. The calculated result shows that though the lateral amplitude exceeds the limit value of traffic safety given by code, the running safety, smoothness and comfort of train on Shiguo bridge can be guaranteed with the existing operation condition. The measurement of rate-limiting or reinforcement is not needed to be taken for Shiguo bridge. By comparison between the lateral amplitude of the bridge and corresponding limit value, it can be seen that the existing limit value of traffic safety of lateral amplitude is too conservative, with which the transport capacity of existing railway bridges is restricted. A method for establishing index of traffic safety for railway bridge is proposed on the basis of the analysis theory for train derailment, and the detailed contents are as follows. The lateral amplitude on the middle of beam is determined as evaluating parameter of system of beam and pier for traffic safety. The critical system of beam and pier with which the running safety, smoothness and comfort of train can be guaranteed is determined. The lateral amplitude of critical system of beam and pier is calculated and determined as limit value for traffic safety. The limit value of lateral amplitude for traffic safety for Shiguo bridge is determined as L/4750, and the calculated results have been applied by Jinwen railway corporation.
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