I just built a 23" by 11" micro layout. It's DC ( I had trouble with DCC ), uses Peco electrofrog and Peco flextrack. I was amazed of how so smooth the Atlas TH&B GP7 runs on it. I have other engines that are good too on a switching layout, Atlas CPR GP9, Life-Like TH&B SW9-1200, Atlas Atlas L&N MP-15 DC ( I know it sounds odd for a Canadian based layout ) and Life-Like MoPac GP-18 ( my 1st N scale engine ). Here is a pic of the marvel. and the layout that includes what the Brits name a "sector plate" Switching is fun. Any other suggestion for a smoooooth switching engine ?