After Christmas the track is laid out and power applied. Viola! Then the questions begin: is it running too hot? Why won't it levitate? Can I leave it plugged in but off?
In the old days, experience would guide my answers.
Today, we can collect quantitative data. I have a thermographic camera that plugs into my phone which allows real time quantitative thermal imaging.
The train engine is the colored blob left of my son. The wall transformer is in the image center. Both are about 12 degrees above background.
Neither is as warm as a person...
The trains can run!
Above is a closeup of the N-Scale engine after about an hour of intermittent use - it has hot spots, nothing hotter than is safe however.