Abstract: This study investigates the safety limits of rail corrugation on small-radius curves of heavy-haul railways. A heavy-haul vehicle-track coupled dynamics model was developed using multibody dynamics software. The rail corrugation was simulated as continuous harmonic excitation, and track irregularities were modeled using a cosine function. By applying the corrugation as an input excitation, the dynamic response of the wheel-rail system was computed. The analysis focused on the influence of corrugation wavelength and wave depth on the wheel-rail interaction. Based on this analysis, safety limits for rail corrugation on the specific small-radius curve were proposed. The results show that for a fixed wavelength, the damage severity increases with the wave depth. Conversely, for a given wave depth, shorter wavelengths cause more severe damage. For the R800m small-radius curve on the heavy-haul railway, the recommended grinding limits are 0.70 mm for the wavelength range of 100−160 mm, 0.90 mm for 160−200 mm, 1.00 mm for 200−260 mm, 1.20 mm for 260−280 mm, and 1.30 mm for wavelengths exceeding 280 mm.