@gunrunnerjohn posted:You're playing with fire Arnold, Lionel electronics specifies a maximum of 19 VAC.
I've found that on TMCC and early Legacy (could be LC+ as well), that you need at least 16 VAC on the track for couplers to work. I run with 18 VAC Lionel PH180 bricks, and I've never had any issues with a properly operating locomotive couplers operating properly.
Thanks, John, for the warning. I normally run my speed control locomotives at 16 or 17 volts, so I'll make a point of never exceeding 18 volts.