Is it more feasible to "drepress" or cut into and down on the blue insulation board and have the rails follow that contour than making sure you have enough length of track to have a 2.0% grade? I want to have a few operations in the mountains on my layout. So, rather than having the grade be a tad bit steep to get to a minimum of 2" clearance between the zero elevation track and the bottom of the bridge that track will go under, couldn't I "depress" the foam to go down, have the zero elevation track follow that drop so it can make that 2" clearance? Just curious if anyone has done this and how they went about it. I am sure someone has. Thanks.