I have not done HO trains in 30 years since I was a kid. I pulled out all my old stuff, and now am getting my kids up to speed. Of course my new layout is light years ahead of my simple loop from when I was a kid. But my question seems so basic, I hate to ask. My controller has 12V DC and 16V AC outputs as well as the variable output for the track. Which (12VDC or 16VAC) should I use for the track splits. Both seem to work just fine, but for the life of me I can't seem to find this anywhere on the net.