Performance of acceleration or deceleration of railway vehicles is limited to adhesion force. It is well known that adhesion coefficient between wheel and rail tread has some difficult characteristics; one of them is its descending tendency with the ascent of rolling speed particularly under water lubricant condition. We need to know these characteristics as quantitative descriptions, and arrange them to an easy-to-use way for design of running gear such as powering or braking devices. In this paper, a measurement technique on operating train and an advanced evaluation method of the adhesion coefficients are introduced.

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