There’s has to be a better way! The whole idea was to replace too tight a curve (see T&T, width of ladder track) into the trestle. In doubling the length of the curve I also introduced some significant changes in grade. Grade I don’t want to change because it slopes away from the house.
Since I have over a yard of rock left over from another project, I started lumping them in. Not good.
Then I did a trial of laying out a line of the largest rock and filling in with some junk sand left over from yet another project and repeating two more layers with smaller rock and sand until I am just under the roadbed. Note: the finished layer will ballast, probably #2 poultry grit, Sand is just for trial purposes.
Given I have over 30 feet of roadbed elevated from 4’’ to 9’’ this is starting to look like a lot of work. Is there a better way?