Minor update to trackplan …
The first trackplan that I had posted a link to in my original post, showed an initial design for the entry into the storage yards. Because these are located beneath the main layout, approximately 150mm, this design produced too steep a grade.
So, I relocated the entry further back around the curve, which gave a longer distance to the start of the yard throats. This produced a 2.8% grade, which equates to about a 1 in 35 grade. This still may be too steep, so I may have to shorten the length of the storage tracks.
Anyway, here is the amended trackplan.