Good Question.
You have the circle, one train, drawing 35 watts and the extra feeds to help.
Muliple trains, switches lights, accessories, add up fast. Manufacturers recommend only a 75% use of wattage .
Does this make more sense.
Does your train run alright?
You have good track connections with leads every 20 or so feet. I go with 8 feet on my old stuff ,cpok,his is older.
*80 watts is not bad.