Railway brake discs are the safety-critical components usually designed for up to tenrnyears of operation. To guarantee the safety, fracture mechanics method is usually appliedrnto perform the prediction of fatigue crack growth. The main purpose of this study is tornanalyze the stresses and fatigue crack propagation of disc brake under different speedsrnand load of AA-LRT train services. rnMechanical and thermo-mechanical fatigue crack can often be found on the frictionrnsurface of brake discs used in railway vehicles after a period of usage due to exposure onrnheavy thermal and mechanical stress during braking and radial crack patterns that mostlyrnoccur. A brake disc crack exhibits different initiation and propagation behaviors withrnrespect to different braking conditions. In this paper, the effect of braking energy onrnbrake disc fatigue crack evolution is investigated by using a novel Extended FiniternElement Method (XFEM) implemented in ABAQUS software for a train operating atrnacceptable and over speed at room temperature (25 rnornC) and at higher temperature (500 rnornC). Simulations at 4, 8, 12, 16 and 20mm crack length reveal that crack propagation thernmaximum effective stress intensity factor increase from as the crack length increased andrnaccordingly the crack propagation rate increases at the crack size become large. On thernother hand, the effect of temperature and speed were observed from the results torncontribute to the increase of crack propagation for larger crack size. rnIn all cases, over speed and high temperature, as the braking is applied repeatedly, lead tornincreased propagation rate of the crack on the friction surface of the disc.