I bought my first HO Atlas train set 20 years ago but set it aside while going through a messy divorce. I do not believe the train was the problem. I picked up my love for model trains over Christmas 2014. My track layout is a twist on the Atlas "Apex and Hypotenuse" with the section that was elevated now  being tunnels underneath instead. I'm running DC because that is what I have for now. The Setting is late 1800's early 1900's mining and logging. Thanks for all the great info!