A loaded sulfuric acid railcar was being pressured up for shipment when a 2-inch cap on the induction tube on top of the railcar failed. Sulfuric acid sprayed out of the induction tube and was released into secondary containment; a portion of the released liquid contacted an employee working on top of the railcar/on the loading rack. The employee was hospitalized for exposure to sulfuric acid (93%) on the face, upper torso, and bilateral upper extremities including the hands.