If you are recreating some sort of model layout i.e. you are not creating a train sim then you can just create some 3D models representing straight tracks, curved tracks, crossed tracks and points. That way you'll be able to put the whole track together piece by piece just as with your home train set. Take a look at some of the catalogues produced by big companies such as Hornby, Maerklin, Roco, Fleischman, etc. They all have a section describing their track system i.e. showing all the pieces with their lengths and radii. That should be a good starting point.
Barney
Barney