Having 83 spur sidings which were in reality simply a threshold to the concrete abyss I needed an abatement to the fatal effects of motion followed by gravity. However the purchasing department only had so much cash allocated for bumpers so mother creativity was tapped for resource.
First I tried left over OP soldered rail bumpers:
Kind of OK as long as you do not touch then with human appendages, hands, arms, belts or bellies.
Due to urgency I grabbed a roll of Toyota vacuum hose, cut off 4' lengths (a.k.a. 1") and some #1square drive trim screws and placed them just inside the rails for contactless Covid coupler contact. Works great, just need to find a prototype (as if I really care).
In looking further I found Lionel bumpers (thanks Bob for the source!) that looked nice until a car actually needed it. Oh well. I found that when a long train is backed onto a short siding equipped with these snap in bumpers stuff goes airborne, nice for carpet, not for basement floors.
After looking closely I saw a spot that beckoned for a fastener. Presto one drywall screw, that bumper should now be able to break some couplers! I think there are two versions of them, the lighted version readily takes the screw.
Now I only need Santa to give me about 6 dozen more of them.