Yup, just looked it up and I was wrong.
You must be registered for see images attach
http://comicbook.com/2014/10/13/the-walking-dead-was-that-negan-/
Oh...that's interesting. I wish they had made that more clear in the episode. It happened so fast that I didn't realize who that was during that one scene. I think also it was so dark during the train scene it just wasn't really apparent to me one bit. Maybe changing the dialogue in that scene would have helped or something.