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This paper proposes a long-term real-time tracking method for track slab deformation considering wavelet packet energy (WPE) using dietary fiber optic accelerometers to record train-induced vibration. We found that the vibration response legislation of track slab deformation could be founded using the WPE regarding the regularity band since the very first- and second-order frequencies caused because of the adjacent carriages. A field test had been done for longer t