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传统的机车车辆车轮踏面存在着通过曲线时容易引起轮缘与钢轨接触的缺点。其后开发的圆弧踏面虽然可以改善曲线通过性能，但由于中立点附近的锥度较大，因而直线走行稳定性较差：针对这些问题，日本东海容运铁路公司开发了一种在中立点附近雉度小，轮缘前沿锥度大，能与钢轨实现良好吻合的新圆弧踏面，经试验台试验、现车运行试验和耐久试验表明，这种踏面不但具有良好的曲线通过性能和直线运行稳定性，而且可以有效延长镟轮修整周期。
The traditional locomotive vehicle wheel treads have the disadvantage of easily contacting the wheel rim with the rail through the curve. The subsequent development of the arc tread although it can improve the curve through the performance, but because of the larger taper near the neutral point, so the straight line is not stable: In response to these problems, the East China Sea Railway Company has developed a capacity in the vicinity of the neutral point Pheasant small, large rim front taper, with the rail to achieve a good match of the new arc tread, the test bench test, the current car running tests and durability tests show that this tread not only has a good curve through the performance and stability of the straight line Sex, but also can effectively extend the wheel trim cycle.