A 60AT unymmetrical section railroad rail is a new material developed for using at the bifurcation of the railway. The fatigue experiments and numerical simulations have been carried out and presented in this paper to estimate the service life of the rail. This unsymmetrical geometry section results to complex in the analysis and detemination of the rail service life. The experimental results show that the ratigue cracks grow from the short flange at the bottom of the section but the head as the symmetric section rail. The simulation results of Mises stress ahve given a stress ratio 2.91 between short and long flanges at the bottom, which proves the lower service life at the short flange, In addition, the symmetrical section 50AT and 60At rails have been made for the results with unsymmetrical section railroad rail.
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