In a placid lagoon about a mile inland from the Atlantic coast in southeast Nicaragua, the mast of Cornelius Vanderbilt's dredge boat rises out of the water. The railroad tycoon abandoned it along with his dream of building an inter-oceanic canal in the 1850s. More than 160 years and several failed plans later, Wang Jing, a 40-year-old Chinese telecommunications billionaire, has emerged as the next mogul to give it a go.