Thank you Gunrunnerjohn. I have several Railking locomotives that have LED lights but not before 2017 so that may be the year it started.
I'll do some more research as far as passenger cars go and post a new topic if needed.
The item I'm looking at is MTH 30-67707 but it does not say LED, just lighted.
Thank you for the help you provide here on this forum.
Brad