I was into that too over 20 years ago. I sure do miss it, but I'm so far behind I wouldn't know where to start up again. I hear they have computers controlling trains now.
I had a 5x9 layout, all flat bed with a max of two train running with no switching needed. It sure was a lot of fun back then.
I may get back into it after I retire. The 727 takes all of my time, money, and passion now.