Wow, the pictures look amazing!
Yes, the look of line scan images were an inspiration for this project. But of course, I also tried to keep BOM costs down and so ended up with a RP4 + RPi Camera.
The RPi HQ camera is a nice step up from the regular RPi camera while being not too expensive too. Incidentally, I also have a project using that [0] but unfortunately no trains where I live.