You could try adding one at a time to see if there's a conflict between your mods? So, test elevated rail with quality, then elevated rail with space age, then quality and space age.
This is just from general experience, btw; I actually don't play factorio! Just offering some of the basic troubleshooting I've used with other games. Hope it helps!
Are there any other forum sites you can post at for help?
Well, I don't suppose they have a customer service email or something you could reach out to? But that does add an interesting wrinkle.
I'm curious now; if I end up researching this later, I'll make sure to report back anything I discover. But yeah, at this point I'm stumped!