Yes. During a lengthy remodel years back, my garden rr wasn’t running. So, i made a temporary, tiny 5x9 frr (R1) in the basement.
Occasionally, id run a stainz or forney. Long story shortened, cars can derail. If rail is close to the edge, they can topple off. All it takes, among many things, imho, is a slight rail gap. Had this happen to a forney. 3 ft down to concrete! Broke the outside frame rod cranks, nothing else, ….not much, really, but a real bummer.
Luckily for me, this was at a time that lgb parts were cheap and readily available from lgb.imho, not so simple, nor affordable anymore. Thus, my unsolicited, but well meaning, suggestion. I hate broken toys.lol
I do like the idea of wires. Ive seen these on other layouts, possibly in old LGB catalogs. They are less obtrusive and seem effective, so long as they are high and stout enough. Not giving it much thought, but a good quality elastic might be good too. Gentler regarding abrasions, possibly. Perhaps appropriate eye hook screws/?