Abstract
The difference in track quality for new and existing urban railways influences comfort and security in train operation. In this paper, the track quality of two typical urban railway lines in one city was studied. The Sperling index, which was obtained based on data collected from a self-made accelerometer fixed on the operating vehicle, together with track geometry data, were used to determine the influence of existing and new lines track condition on train operation. The results show that peak and Sperling values for the new urban railway is lower and achieves the qualified standard, while existing urban railway exceeds the standard. The quality state of horizontal operation for both lines is worse than that of vertical. The Track Quality Index (TQI) can reflect the quality state of train operation to a certain degree, and then maintenance is recommended to be carried out for the different urban railway conditions.
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