Reply to "Can I run 1982 illuminated passenger cars with a modern command control engine at 18 v . . ."

They do glow bright for a little while at 18 volts Though they are a bit expensive to swap a fleet, LED's will be the way to go if you want dim lighting.  Remember to check any plastic bodied car for warmth when running at high voltage. I've seen many a ruined caboose.