In some sense, I agree with you -- there is nothing about this package that is necessarily specific to trains.

However, this seems more like an art program than a CAD program. All it does is draw and manipulate straight and curved lines. It doesn't keep track of any relationships or properties of the lines, and it doesn't know anything about areas defined by the lines. SteamCAD seems like a poor program for developing and exploring designs, but a good program for presenting designs in a particular style.

I found this in the manual (page 23):

"SteamCAD is focused on the presentation output, not for creating an asset for manufacturing. So each SteamCAD work should be more artistic work than engineering drawing."

> All it does is draw and manipulate straight and curved lines. It doesn't keep track of any relationships or properties of the lines, and it doesn't know anything about areas defined by the lines.

All 2D CAD software worked like this for a long time. It's "Computer Aided Drafting": a computerized way to do what used to be done with pencil and paper.