Model Railroading has come along way since the days in my parents basement.I was trying to explain to my father in law ,how trains today work.Basicly I told him they are little computers on board with real life action and sound. On my layout I run a NCE system with additional NCE power pack.With a DCC system on your layout you can run many trains at once controling each train individually.This makes the action realistic and you are able to switch in a yard for example the same time the main line is still operational.I will be updating this post as I get more information or learn new tricks with the DCC system.