On the Impact of Surface Morphology and Transfer Film on Brake System Performance of High-Capacity Metro Train

The brake system of Melbourne’s High-Capacity Metro Train (HCMT) suffers from consistently extended braking distances after repeating a set high-speed tests and the commission process. degradation performance affects safety rolling stock its conformance to design standard. In this paper, root cause leading degraded was analyzed. discs pads affected train another with normal working conditions were removed series examinations determine reason for change friction coefficient between surfaces. results revealed that disc samples TS02 trainset suffered changed transfer film surface morphology multiple consecutive applications. factors may affect analyzed in laboratory. It found had lower hardness level, friction, smaller contacting area pad when compared trainset. These harmed system, decrease effort led longer distance than expected failed tests.