An anonymous reader shares a report: Elon Musk introduced his vision for a futuristic mode of tube-based transportation called the hyperloop in 2013. In an exhaustive white paper, he laid out a body of research conducted with his team at Space Exploration Technologies demonstrating the system's viability and seemingly offered it as a gift to the entrepreneurial community. "I don't have any plan to execute because I must remain focused on SpaceX and Tesla," he said in a conference call at the time. He apparently changed his mind. Last month, the SpaceX and Tesla chief executive officer revealed on Twitter that he'd received "verbal government approval" to build a hyperloop capable of ferrying passengers between New York and Washington, D.C., in 29 minutes. The tweet came as a shock to executives at the various startups racing to develop their own hyperloops based on Musk's specifications. Several of them initially expressed hope that Musk would simply dig the tunnels and perhaps choose one of their startups to create the physical infrastructure, which involves a tube-encased train traveling at speeds faster than an airplane. Nope. A person close to Musk said his plan is to build the entire thing, including the hyperloop system. Musk also holds a trademark for "Hyperloop" through SpaceX, which could be used to prevent other companies from using the term, according to U.S. public records. The billionaire's unexpected entry into the hyperloop business could threaten the ambitions of three startups, which have raised about $200 million combined from venture backers. "There's probably a finite amount of capital willing to bet on this space -- and bet against him," said Jonathan Silver, the former loan programs director at the U.S. Department of Energy. Silver learned not to underestimate Musk after overseeing a 2010 loan of $465 million to Tesla, which the electric carmaker paid back, with interest, nine years ahead of schedule.