Sorry Ed, there is a way to do that.
Make a temp folder on your desktop, Open the route you wanna adjust for "edit in explorer" in cmp
Copy everything in there over to your temp folder.
Open TransDEM, and select the Trainz button, select "Adjust elevation in entire route", select the folder you copied to, and set elevation.
Copy the files back to its original position inside Cmp, commit, and youre done.
Lars