An employee was loading a roll of paper (500 to 800 lbs.) from a railcar onto a powered industrial vehicle (PIV) when the roll fell on top of the employee's PIV protective cage. The employee raised his hand to protect himself and his fingers went outside of the cage and were crushed between the bar of the cage and the roll of paper. As a result, he sustained a partial amputation of his left index finger and debridement of his left middle finger.