Abstract
White layers generated on rail surface due to wheel spin or skids are thought to be an important factor of rail cracks, shellings and subsequent breakage after passing tonnage accumulates. It is of great beneficial to rail maintenance to clarify a correlation between them. We have reported that it is able to detect white layers by using Superconducting Quantum Interference Devices (SQUID). In order to run Nondestructive Tests (NDT) in the field, we have developed a noise feedback system to stably operate a SQUID under environmental noise. In this study, we confirmed that the NDT scanner is able to detect white layers.
