The Rams have signed Samkon Gado and Darius Walker.  The 25-year old Gado has played in 25 games (8 starts) in his NFL career and he has carried the ball 252 times for 942 yards (3.7 ypc) with 11 TD runs.  He also has caught 40 passes for 267 yards (6.7 avg) with 1 TD grab.  Gado will likely get some playing time immediately with Steven Jackson still hurting.  The Rams have added Darius Walker to their practice squad.  The 23-year old Walker played in 4 games (2 starts) as a rookie last season for the Texans and he carried the ball 58 times for 264 yards (4.6 ypc) with 1 TD run.  He has also caught 13 passes for 81 yards (6.2 avg).  The Rams were smart to sign both Gado and Walker as they both have decent upsides.