You can use Descartes "Smart Snap" to select the highest point along the top of rail to trace the rails or the 3D line follow tool if you have intensities to your point cloud. This will give you a rough horizontal alignment. fyi- InRoads ss3 has a …

Hi, The following channel has lots of videos that will aid you with your workflow. http://www.youtube.com/user/GeoSpatialAE Some specific videos to assist you with creating a dtm: Terrain from Point Cloud : https://www.youtube.com/watch?v=vVLDWyc7n_Q&list…