Yes, John, sir. the trouble is I have a tunnel system in which I was considering changing the track inside from JR terrain to another type. My tunnel is not "ordinary" tunnel content but custom made from various "off-the-shelf" splines as stone walls, concrete paths, sidewalks and concrete slabs meticulously stitched together. In wire-frame view, the camera still can't see through the tunnel material though it can see through the mountain from above. The spline point circles are visible but there is a lot of confusion as to which are spline object points and track joints. The track is not visible because of the tunnel roof material, the overlapping concrete slab sections. Yes, my tunnel has a flat ceiling, not arched. When I originally constructed the tunnel, the ground was flat and the mountain was not yet formed over it so I could still get the camera inside the closed tunnel to lay the tunnel floor (an afterthought even then) by sealing off the gaps along the wall bases next to the track ballast and in between the tracks to keep underground blue sky light from leaking through. I thought about making the tunnel a solid concrete floor with a non-ballast type track but I don't want to go through the trouble of flattening the mountain and reforming it again. It's no big deal. I can live with ballast track inside my tunnel with concrete flooring along the edges as trim. I used no-ballast track for my bridge decks anyway and that is much more noticeable than tunnel interiors. This custom tunnel is made for an American standard gauge two-track line with typical American load gauge. Dig holes were used near the portals of course. There is no known content available for an American two-track tunnel.
The Surveyor camera would be great if it could go underground as to modify a subterranean tunnel interior easily if one so desires. Why the camera height is limited to above ground makes me wonder. There are many instances I wish I could get my camera low to or below the ground between two close high points of terrain in narrow canyons or near steep cliffs. After a tunnel is buried, the only way its innards can be viewed is by being inside a driven train cab. Chase view cameras won't go inside tunnels below ground also. The chase view camera acts the same way as the Surveyor camera in this sense. It simply won't go underground.
