what is the best way to add traction to a usra 0-6-0 i am having trouble with two areas on my layout that my locomotive starts to spin out then regains traction and moves along again..

the tender behind my locomotive has a heavy weight that is removable. if i where to take it out and operate the train would it help my loco pull inclines better?? what is the purpose of this such heavy weight??

i purchased a bachmann 0-6-0 engine that didnt have a smoke unit installed
after buying the engine i noticed the same engine was available with a smoke unit

i purchased a model power smoke generator no 11
the directions say to hook black wire to headlight and light colored wire to reversing switch?
my smoke generator has two wires that are both black and the motor unit is sealed up with only two
tabs sticking out the back with springs to make contact with the chassis

some one please explain to me how to properly hook up this unit in my loco...thanks in advance