I am working on getting back into the hobby. Feel free to check out my start in the N scale forum. Anyways, I am unsure of a few things. What do the numbers mean when describing an engine. For example 2-8-0. I have no clue what that means. What are the good couplers. I picked up a nice atlas engine, an atlas car, and a cheap life-like engine and car set. the atlas couplers easily release when going around a bend, but the life-like ones seem to hold strong. any advice or maybe a link to show me how to change couplers would be great. Of course I have more, but I am experiencing a brain fart and cant remember them all. I am sure they will come to me later.