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This paper shows a new method for numerical modelling of railway track in Autodesk Symulation Multiphisics software. The model of non-conventional railway foundation type of LONGASF is analysed. The improvement of modelling process of railway track considered as a structure consisting of separately modelled components is presented as the main novelty of the paper. The created model aims to improve design capabilities associated with change of individual material properties and, consequently, the change of railway track structure. This model allows an analysis of many railway tracks, depending on their material solutions. The obtain results are analysed in order to formulate the guidelines for design of this type of railway track.

FEM Based Improvement of CAD for Non-Conventional Railway Track