CONTRACTOR EMPLOYEE WAS CLIMBING AN ACCESS LADDER ON A RAIL TANK CAR. THE EMPLOYEE WAS CARRYING A ROPE IN ONE HAND AND MISSED THE RUNG WITH THE OTHER. HE FELL APPROX 9 FT AND STRUCK BACK ON BO LT IN FENCE RAIL. HE SCRAPED HIS BACK. PHYSICIANAPPLIED STITCHES AND PRESCRIBED PAIN KILLERS.