Is it a true statement that in the prototype world the ballast is used as a bed for the ties and track? If so, I was wondering if this would work out OK. When I lay my track on top of the roadbed (HO) and then ballast, I get a really thin layer between the ties, and sometimes you can see through to the roadbed. So what if I used, say 1/8" shimms, to raise the track off of the roadbed and then put the ballast down. Would this not give the appearence that the track and ties are sitting on top of the ballast, like it is in the prototype? What do you think?