Shares of Walt Disney and Caterpillar are posting strong returns Tuesday morning, sending the Dow Jones Industrial Average soaring. The Dow is trading 603 points higher (2.0%), as shares of Walt Disney and Caterpillar are contributing about one third of the index’s intraday rally. Walt Disney’s shares have climbed $7.25 (4.2%) while those of Caterpillar have climbed $7.47, or 4.0%, combining for a roughly 97-point boost for the Dow. American Express JPMorgan Chase and Boeing are also contributing significantly to the gain. A $1 move in any one of the 30 components of the index results in a 6.58-point swing.