I'm trying to run 2 separate trains on my 4'X 8 "L" shaped layout. Can I use 2 radius curves at the points where the tracks will cross each other? Any suggestions for my second power pack? I can use all suggestions and help in doing this. Not sure where to put the second track. The first one goes up a riser and through a tunnel along the outer edge of the layout.Just starting and know nothing about power packs except the one that came with my set. Thanks for your time and help.