Well, with that one gone I had an empty wall with already mounted wall bands for an Elfa shelf system. Those are wall bands left there from my former Tehachapi Summit layout (Comment 17 September 2022: the blog describing this layout no longer exists). Since I had brackets laying around as well, getting a new shelf up would not be problem.
But I started by attaching my old backdrop, used both on the Summit and Three Yards Yard layouts, as seen in the picture below. It needs a fresh coat of paint, but apart from that it was all ready to go.
It is no problem to just lift it off the brackets and down to the cupboards below when I shall work on it, if I find its normal height to awkward.