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Tens of thousands of passengers travel by railway transport every day. Therefore, driving safety and comfort are the most important things for passengers. The track irregularity and defects are important factors that threaten safety. The track inspection method has timeliness, economy, reliability, and convenience, and the inspection results can provide on-site maintenance personnel to maintain the serious track irregularities as soon as possible. The theme of this research is a discussion on measuring train vibrations with a smartphone. The measurement equipment used a built-in three-axis accelerometer in the smartphone. GPS positioning is used to grasp the location of the vibration. Finally, the wireless network remote transmission technology is used to make the measurement records can be quickly returned for subsequent analysis. If the APP is installed on the smartphones of all route inspectors, it will be more conducive to universal and comprehensive promotion. Therefore, in this study, a smartphone APP was installed on four experimental smartphones of various brands. First, verification of the accuracy of the four smartphones using the Stewart Platform, then carrying out the smartphone GPS positioning error experiment. Finally, measurement 51 times of the railway route in operation with Tze-Chiang Limited Express. And compare the measurement accuracy of a single smartphone multiple times, then compare the measurement accuracy of four smartphones with each other. Finally, the measurement data of four smartphones were compared and analyzed with the measurement data of the GPS Rider. To explore the possibility of the practical application of the smartphone APP in the inspection of the track quality of the operation route. Comparing the measurement data of four smartphones and the GPS Rider. It is found that the allowable error of railway mileage less than 25 meter is 29.03%, and the allowable error of railway mileage less than 50 meter is 49.3%. From the southbound data, the allowable error of railway mileage less than 25 meter is 32.2%, and the allowable error of railway mileage less than 50 meter is 47.8%. Both showed an accuracy of about 50%, and the accuracy will continue to improve through the increase of measurement data.
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