Comparing this to the previous two images shows the relative offset of the staging level from the main level track to allow more clearance between staging level trains and the bottom of the main level roadbed (1.5" spline).

Elevations are 40" on the top (Circleville), 42.5" in the yard.

Roadbed will be 1.5 - 2" Homasote spline (2" is preferred, 1.5" where clearances require) for main and sidings, 1.5" spline or 1/2" Homasote on 1/2" plywood in yards.