Williams Locomotive Questions - Classic Toy Trains Magazine

I haven't been at this very long, so I have some very basic questions concerning Williams locos.  All I have purchased so far has been Lionel products and to keep it polite I’ll just say I am less than satisfied with their locomotives.

My questions are:

Are the Williams locos Standard or Traditional O as defined by Lionel.

Can they be operated with a Lionel CW80 Transformer?

Will they operate on Lionel’s FasTrack, especially their switches without bouncing around and derailing?

Will they couple up properly with Lionel and K-Line cars?

What I’m looking for is a dependable locomotive that will work with all of this Lionel equipment that I have purchased, otherwise  I’m ready to EBay and yard sale what I have to recoup as much of my money as I can and move on to a new hobby.