News Brief: Mark this down for later: Tech billionaire Elon Musk says the Boring Company could begin work on the express tunnel linking downtown Chicago and O’Hare International Airport in three to four months, and have it finished in three years. Musk, who’s famous for overly optimistic timelines, laid out that plan today as he stood alongside Chicago Mayor Rahm Emanuel to announce the deal at a news conference in the unfinished Block 37 transit superstation. “We’re super-excited to do groundbreaking technology in one of the greatest cities in the world,” Musk said. Emanuel said he was sure the “X” (for Express) would be a faster alternative to Chicago’s famous “L” train system. For more about the X, check out our earlier story, our TLDR roundup, and this video of the news conference:

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