Objective <p>The primary focus of this work is to evaluate dynamic responses of precast slab track systems under the influence of high-speed trains. This study is crucial for India, as it addresses the challenges of implementing advanced rail systems to meet growing transportation demands while ensuring safety, efficiency, and sustainability.</p> Methodology <p>A computational methodology based on moving element method is utilised, incorporating moving coordinate system in order to model vehicle-track coupling system in terms of dynamically behaviour. The vehicle is represented as 26-degree-of-freedom multi-body system, with nonlinear Hertz contact theory governing wheel-rail interactions. The slab track is demonstrated as three-layer Euler–Bernoulli beam structure, considering nonlinear friction behavior of rail pads. The study solves nonlinear dynamic equations of motion using Newmark integration method.</p> Result <p>The results indicate that moving element method provides accurate predictions of dynamic responses, with outcomes aligning closely with traditional finite element methods. Parametric studies highlight effects of track irregularities, train speed, and track material properties on system's performance. For optimal design, stiffness of rail pad, subgrade, and cement asphalt mortar layer are identified as critical parameters.</p> Conclusion <p>This study concludes that moving element method is an efficient and reliable computational tool for analyzing dynamic interactions in high-speed rail systems, offering insights into optimizing slab track designs. The model assumes linear elastic behavior for structural materials, such as concrete and mortar, which may not fully capture nonlinearities under extreme loading conditions.</p>