@Lehigh74 posted:The LWs (125W), TWs (175W) or 1033s (90W) would all be good for track power. I don’t know much about the BW or Williams transformers. If you are running MTH locomotives, they might be a problem. I don’t see them on the MTH transformer compatibility chart. I have heard the CW (also not on the MTH chart) does not play well with MTH locomotives.
Yes, I do have MTH engines (all new to me....I fell in love with my brother-in-law's MTH's last Christmas and decided to add some Rail Kings to my stable). I do recall reading that MTH engines prefer a pure sine wave, and it's possible the BW and Williams have chopped. Either way, that's an easy switch for me. I also have 2 RWs right now in service in a bedroom around-the-ceiling setup with only TMCC. I could put the modern ones there and go with LWs, RWs, or TWs in the basement.
My biggest reason for putting 2 transformers and, therefore, 2 channels per loop is to provide enough power for 2 trains. It's more about the power than the TIU. I envision a single LW (my highest-output PW transformer) with, maybe, 100W output, getting overly taxed by 2 trains. Guess I could try it, but to me the math doesn't add up, especially not with passenger cars.