I did not see a prior post to answer this, so here goes. I'm pretty new to model railroading, even though I'm 54. For a few years, I've hooked up a simple Lionel railroad under my Christmas tree. Last year I got a second train and I just purchased a third. So far I have run one train at a time on a fairly basic track set-up using the 40W transformer supplied with my first train set. I want to hook up a larger, more complicated track and run two (maybe more) trains at a time. I will need a new power source and was thinking of getting a new model Lionel ZW with two 135 or 180 W powerhouses. Does this make sense? Are there other ideas or things I should know? Thanks for your help.