NFL Primary LogoNFL Alternate LogoNFL Wordmark LogoNFL Team History Who is the greatest running back in the NFL of All-time? Tony Dorsett Adrian Peterson Emmitt Smith Walter Payton Jim Taylor Thurman Thomas Curtis Martin Larry Csonka Edgerrin James Earl Campbell Jim Brown Gale Sayers John Riggins LaDainian Tomlinson Marshall Faulk Franco Harris Marcus Allen Eric Dickerson Jerome Bettis Barry Sanders …