Terry;
Not what you are looking for, BUT thought I would post this here as well. The magnets described below are very small and can be mounted on top of a tie without disturbing wheel flanges. Others may find them usefull as a replacement to the LGB product.
Just a comment about magnets. If you are already using a Phillips Sonicare toothbrush, or know someone who does, those brush modules use one or more very strong miniature magnets on their base. When it is time for me to discard an old brush module, I “harvest” the magnets from it. The magnets are glued to the base of the brush module. They can usually be knocked free with a light hammer and a small chisel or cheap miniature screwdriver.
Presently I just use my magnets for whistles and bells, and I have a nice supply of them. When these magnets are secured to a tie with 3M blue poster putty, they almost disappear from view.
Hope this helps,
David Meashey