BIM and quality have been the main focus of the development of RailCOMPLETE. When building a RailCOMPLETE model, you do not just create a drawing, but you build a rail system. A BIM object usually consists of a 2D symbol, a 3D model and a set of rules for how the object is located in the model. Our basic idea is that the system should notify design errors during modeling. Our goal is that engineers should not use meaningless time to correct drawings, but rather use their expertise to develop good design solutions. At the same time, we want new engineers to work safer and more efficiently with professional support from the RailCOMPLETE model.