Keywords: heavy haul railway, track irregularity, sensitive wavelength, limit management, vehicle-track simulation model, maintenance.

The benefits of low cost of transportation, high efficiency, and big volume have led to the rapid development of heavy haul railway in China. However, given the features of heavy haul railway traffic, there are no dynamic management guidelines for track irregularity. Field testing and simulation analysis of the heavy haul test line are required, and the heavy haul freight train line's track irregularity management standard must be presented. This study establishes a rigid-flexible coupling dynamic simulation model of heavy haul freight train and validates the simulation model with real detection data of a specific line. The investigation focuses on the heavy-duty trains 's sensitive sensitivity for height and irregularities in track. The sensitive wavelength is determined to be 10 m based on the simulation findings and field measurements of the chord length, which are 10 m. The amplitude is adjusted in the sensitive wavelength analysis until the vehicle dynamic response approaches or surpasses the safety limit. The suggested value of the dynamic management IV speed restriction for track irregularity is put forth, taking into account the safety margin of 1 to 2 mm. For heavy haul railway lines, it offers a theoretical foundation for managing track irregularity, developing maintenance management guidelines, and formulating irregularity maintenance.

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