Working on a new layout where there is a triple parallel mainline and at least 20 elevated crossovers or stretches of track atop others. On past layouts, my issue has been on the lower levels but I am being told that best to shield the upper level. Any thoughts? Is it possible that in addition to signal propagation from the rails, there could also be signal propagation from a common terminal block under the layout?
So it seems obvious I will need a ground plane to run Legacy and looking for input. Planning to run an earth ground wire between close parallel tracks. Any thoughts on how to best conceal? Does it matter if its under ground foam or homosote or does it need to be on top just adjacent to the road bed?
Regarding the elevated crossovers, it my understanding that you create a ground plane on the underside of the upper track. So I assume it is fine to place the ground plane on the underside of the raised plywood or bridge correct? If not then do I need to shield under each track? I layer bottom up, plywood, 1/2 in foam and then a vinylbed roadbed. Where best to place the copper foil in regards to those layers? Does cheap aluminum foil work as well as copper foil? Thoughts on width or gauge of copper foil? 34, 36, 38?
What is the width of the ground plane material required if I shield the underside of the plywood? If I have 3 tracks on roughly 1 foot wide plywood, do I need to shield the entire 1 ft width or can I get away with shielding less of it
Sorry for so many questions but trying not to have to dismantle elements down the line do to signal propagation.
Appreciate all insights from your experience.
GREG in Wisconsin.