I'm thinking that I remember reading here that running at less than 18V "stresses", or something, "puts pressure"???, on the engine and it heats up some.
I've been running at 15 or 16V in the past but I remember that on last Christmas' layout I ran at 18V.
I don't like 18 because of the lights in the Blue Comet's passenger cars.
comments???
As always, thanks - walt