Will placing powered rails to make powered minecarts go faster? I want to make trains with powered minecarts that push normal ones and ones with chests. I saw that normal minecarts go slower on powered rails, but is it the same with powered minecarts (with furnaces)?
Your sentence is not entirely correct : minecarts go slower on unactivated powered rails.
The purpose of powered rails is to increase or decrease the speed of minecarts ; to increase their speed, they must be activated by redstone.
Powered minecarts will not activate powered rails, and will not accelerate on them either.