I had an entire track plan, and concept in my head which I was going to build in N scale. However, my wife found out that I was going to make the leap and got a bit angered. I have a HUGE ho inventory that I would have had to liquidate. I don't have the room to build my dream layout in a single level. I fear the helix. That aside, I am going to jump off that bridge when I get to it. Can anyone offer me some suggestions. Here is my dilemna: I want to model a line I am familiar with. I used to work for CSX out of the Saginaw, MI terminal. I thought, I would model something that I am familiar with, but I want to run steam, and transition era diesel as well. I started looking into the history of the line. It is rather extensive, dating back before 1900. In 1900 Pere Marquette was formed, and they owned that line (as well as most of the MI railines). They only ever had a total of 4 diesels in there roster as they were absorbed by C&O in 1947. What I am looking for is a way to model all of the prototypes that ran that line PM, C&O, Chessie, CSX and Amtrak. Can anyone suggest a way to do so, and still make the structures, yards, and appliances plausible in that many RR eras?