The Tribune article claims $20-25: http://www.chicagotribune.com/news/local/politics/ct-met-ohare-high-speed-transit-elon-musk-boring-company-20180613-story.htm

The Tribune article claims $20-25: http://www.chicagotribune.com/news/local/politics/ct-met-ohare-high-speed-transit-elon-musk-boring-company-20180613-story.html http://www.chicagotribune.com/news/local/politics/ct-met-oha...