Jim Brown - Greatest running back to ever play the game. Have u ever seen the footage ? It is INSANE ! He was WAY ahead of his time as far as speed size and talent. If you were able to turn the clock back for him his size and build are exactly what the NFL of today wants and he played 30 - 40 yrs ago and retired while he was still young enough to play. Plus he made some killer movies
Walter Payton - completely different style then brown but sweetnes was the shit. I loved the way he would take on defensive backs never shy\'d away from contact and was usually the 1 delivering the BLOW. truely and amazing Talent
Emmit Smith - I was never a Cowboys fan but he was a class act on a team that seemed to have few. Sure of all of the running backs discussed here he was on the best team (as far a rings wins etc) Jim Brown was the team and still managed to rack up the yards and records (in a shorter season mind u). But there is no denying Emmits greatness the numbers speak for themselves. He always seemed like a classy guy to me and who can ever forget the effort he put forth when he help beat the Giants (i think) playing with broken ribs!
Barry Sanders - This is kind of more an emotional vote because i just loved to watch him play. It was amazing. I am a patriots fan but it is still burned in to my memory when he just schooled the pats db turning him around and around (see in those days all the killer highlights were always against the Patriots) and even though it was against my team just loving it. But Barry lost a lot of stock in my book when he just walked away from the Game. I know there was alot of crap he dealt with being a Lion etc but i just never sat well with me. Now Barry was probably given the WORST team of all these cats and he put up numbers and was the only weapon for many many season and the defense would just wait for him and he still would just get it done.
Bo Jackson - Possibly the most amazing running back ever. Probably better then everyone on this list. He was just punishing as a running back. Much like Brown power, speed and size were his weapons. We will never know what could have been but glad I got to enjoy his very short career.
Earl Campbell - for much the same reasons as the rest but another short career