On Shinkansen trains, single-step braking is applied for deceleration from high-speed running to stop without releasing the brake. As a result, marked scoring is often observed on the surface of abrasive blocks installed in wheel tread cleaner and on tread brake shoes found on conventional trains. The development of this phenomenon causes wheels to wear in a concave shape, and wear fragments may also fall onto rails. Eventually, it causes unusual vibration and extraordinary noise. In this study, attempts were made to reproduce wear fragment using a dynamo brake test stand with a view to resolving these problems. A control technique to restrain wear fragments was consequently identified, and its effectiveness was confirmed in a running test. This paper introduces the results of the dynamo test and the running test.