I would normally never say this: what about DC power?
If you are running largely off grid, and you have a large MTH collection, and DCS, then those are DC compatible- one of the new selling points of the WTIU.
Caution- you then need to ensure you never put something Lionel or Lionel related (example K-line or something like an ATLAS with TMCC) because those electronics may be AC only and damaged by DC.
Again, normally, I don't recommend DC for O gauge because so much equipment is AC only- everything from sound cars, operating cars, a whole swath of TMCC era equipment that needs the zero crossing of AC waveform in order for the TRIAC outputs to turn off.
