The unevenness of contact line is one of the factors that considerably influence the dynamic characteristics of current collection system. This paper describes the methods to estimate the installation accuracy of contact lines and reports some estimation examples of real lines. The dynamic characteristics, such as contact force fluctuations of pantographs and motion of contact lines, are calculated from the measured unevenness of contact lines, and the conditions of installation are checked quantitatively. These methods are expected to contribute to efficient maintenance of contact lines for high-speed operation.

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