Station Alignments in Revit

Hello guys,

I am dealing with train platforms. We have to on 2D Plans show the station km like in screenshot. I linked a dwg file to print them but there is a bug in revit. When I have another linked files those have another text with another color, the colors are all shown same. On our plans colors are very important so if I try to raster print it works but it reduces the quality of pdf. So I decided to create a revit family that can place station km on plans. How can I do that? I have a railway spline. How can I manage that as detail element it can calculate that?
Thank you very much!