Can I move path lines that I layed in Google Earth and move them to Transdem using them as vector polylines, or do I need to load all dater into Transdem first then lay polylines.
This is puzzling. I've never seen anything that let's you connect trainz with google earth. Correct me if I'm wrong but I'm pretty sure that you cannot do this
Simple answer: Yes, you can do that with TransDEM.
Since version 2.1 TransDEM supports .kml/.kmz vector data you can produce with Google Earth. It's polylines only, though, no points or areas. Imported vectors in TransDEM can be directly exported to Trainz as splines with no need for using the TransDEM built-in polyline editor for this.
