Abstract
This study presents a numerical investigation of the stress-strain state of the R65 rail and reinforced concrete sleeper using the finite element method. Three-dimensional finite element simulations were performed in the ABAQUS environment. Fatigue life assessment was subsequently carried out using the nCode DesignLife software, and corresponding S-N curves were constructed. The obtained results indicate that the predicted service life of the rail is approximately 770 million tons of accumulated gross traffic, while the reinforced concrete sleeper operates within the infinite fatigue life region of concrete. The developed approach makes it possible to predict the durability of railway track superstructure elements and to support optimization of maintenance planning.