Using regression is not the mandatory point of entry to OpenRail Designer. OpenRail is there to do the job you want to do. Usually regression points come from survey, graphics or text. Text could be X,Y Z columns. The text import wizard helps you to define the format you want to import. So if you just want to practice OpenRail, create a new DGN using 2D seed file, reference the terrain model if you've got one, then set terrain model active. You will get the 3D model. Hit F9 to arrange views with 2D+3D. In the 2D create a geometry, then open a profile view of this geometry and design the vertical alignment. Set it acitve. It appears in the 3D. In the 2D create a corridor....
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