@MichRR714 posted:Agreed, This argument rings hollow at this point. You cannot operate a conventional Lionel engine with TMCC without additional components. MTH made a decision to leave PS1 as conventional engines and not provide upgrades to PS2.
That's not really true either. The PS/2 upgrade kit was specifically targeted at the PS/1 locomotives, though they worked with other brands as well. When you read the PS/2 Upgrade Kit documentation, there are multiple references to the PS/1 models and how to upgrade and what to modify.