I have rrtrack. I used it for years. It gets expensive buying the different track packs. Especially if you use multiple scales. fast forward and I can’t read the rrtrack CDs on 4 different computers. Getting support was a PITA, so, while I appreciate the work Russ Becker put in, I've moved on to scarm, simply because 1 license got me everything and there is no need for physical disks to reload the program on a new computer
I just bought a scarm license. I find it really easy to use. Any rail isn’t bad either.