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The development of virtual simulation and BIM in railway industry has increasingly become a trend. The method of 3D digital modeling is important in design and construction, but the current study of track structure modeling is not accurate enough, and the species are not comprehensive. This thesis was based on the re-development of AutoCAD via VBA, Visual windows was designed for railway track components such as fastening , sleeper, and railway switch., and this paper discusses the method of parametric drawing design and establishing three-dimensional library via VBA language for track Structure. At the same time, custom menu is added on AutoCAD drawing window for connecting with programming, which realizes the automatic modeling of various types of track structure based on VBA, and Visual windows are friendly, three dimensional modeling of track components are simple and accurate. It has certain directive significance to building 3d model library and stronger practical value, which conforms to the development trend of railway industry. Keywords-VBA; AutoCAD; track structure; parameterization; three dimensional modeling

Exploitation and Research on 3D Digital Modeling of Track Structure Based on VBA