@firsttimer posted:...
BTW, Stan, what specific auxiliary power unit would you recommend to power the TIU? I want my two ZW's to power the two separate tracks.
Check your garage or basement storage for an old laptop charger or what not. As mentioned, adapters with voltages like 12V, 15V, 18V are common and pretty much any of them will work if the connector plug is correct. If you post a photo of any candidate adapters with the printing/label I can confirm suitability. Otherwise, I normally direct folks to their local Goodwill store or garage-sale where you can pick one up for 50 cents or $1 but these are not normal times. 
That said, here's one each from eBay and Amazon from US sellers. You can save a bit if willing to wait for an eBay or Amazon seller in Asia. If you prefer to buy local, tell me what stores are available and I will figure out a suitable adapter from the likes of Target, Walmart, Home Depot, etc.
I think you are on top of this. The deal is quite simple. The TIU itself requires about 5-10 Watts of power. If you "steal" this from Fixed In One, then you are depriving your engines of that much power from the ZW. By powering the TIU with an external/separate adapter, whatever power your ZW can provide is now fully available to the track/engines on Fixed Out One.
