Another suggestion if you need an excess quantity. such as with the
Roo manifest / roster, to run the various RR duties........find innovative ways to build on staging tracks.
I too was/am guilty of having far more cars than absolutely needed. So, after selling off a lot of my engines & rolling stock I created 11 extra staging tracks from 15' to 17' in length off scene in three different areas of my basement. Seven of the tracks are pull through.
Five of the total are under the existing benchwork near the end of a branchline. Six of the tracks come off two different levels from the end of two different branch lines on two 16' long bunk like shelves each three tracks wide. That way the staging is spread around the layout.
I found that by cutting a bunch of holes in a few walls and getting the benchwork, staging TTs & staging track down when the land grant supervisor was out of town was the way to go.
Forgiveness is much easier to gain than permission.
This way I do not have to pick up or in anyway handle the cars.