Repeating my previous plea to make these bolder or more vivid (maybe user adjustable). When laying an eased curve and trying to follow your markers or overlay, it's almost impossible to see the faint grey outline as the attached screenshot shows. And with no wire view option when it goes under the terrain it's lost completely. I have added the blobs to the image to highlight where this almost invisible line can be seen. Would it be such a huge coding exercise to improve this please and not just the projected curve but all the outline elements.
One option can be to flatten the terrain for a short section ahead (of course back up the terrain folder as terrain 01 etc), but that works very well too (from experience laying track ). I know it's not the answer you want but it's something that can help.
I have done that on occasion and just reimported the DEM in the specific tile, then smooth the track again. Or put a terrain texture on the ground following the markers. However if you have any clout with the programming team Danny, anything you can do to twist their arm for a slightly better interface would be appreciated.
I mean the best i can do Is point Steve in the direction of this post but I have as much "clout" as you do