Locomotivebuilder

Hi I am building a 2-8-4 steam locomotive in 8 wide. I have bought multiple medium, large, and xl power functions motors to try with my big bens bricks large wheels. I also have a large selection of gears and axles from old mind storms sets. what are the best motors to use to power the driving wheels and what gear configuration should I use to get the best speed and power? I really want to build a steam loco powered at the driving wheels. Is it possible to build an engine this way that will perform as good as an engine with two power functions train motors in the tender? Also I was considering trying to power the loco and tender at same time? I want to build a loco that can pull at least a ten car train with ease.