Hi Again! I want to create two concrete-like areas with the rails passing through those areas: 2 RR crossings for roads and the two tracks running into the Engine house, around which I will also have a concrete style foundation. My question is, what should I do to protect the inner rails from being buried and keep them free of the plaster or what ever material I choose to simulate the cement? I heard somewhere a styrene strip would work, but I don't know how wide it should be, nor do I know when or if I would need to remove it. THANKS!!