Still running trains on the basement floor.
I learned AutoCAD while an RA in the 1980s. AutoCAD Lite around Y2K. Used Draftsight 2D but it went to subscription, then NanoCAD free version, but if you didn't use it for a month, would time out the license. Found out about the IntelliCAD alliance, a group of companies that support a library that is mostly AutoCAD compatible, then put their own GUI over it. I bought CADHobby when it was on sale, ~50$
CADHobby calls itself 3D, but its more like 2.5D.
I've messed around with Fusion360, FreeCAD, TinkerCAD, but since I already now the UI for AutoCAD, I use one that is compatible.
I have found is O72 is not O72, K-Line O72 switches are about 1/8" off from 360/16 * radius, whomever makes the curves for Menards goes cheap on the rail bender so the last 1/2" is straight, it just goes on and on. What I do is put together a circle of the track, try to get it as circular as possible, then take 3 readings of the distance center to center and average. I draw a straight section as a rectangle with a line down the middle, and then a box that has its length (5.5,10,20,36,40,custom, etc). Takes a while to get the individual track sections.
