A rendering of the Red, Purple and Brown Line bypass seen from street level north of the Belmont CTA station. The $320 million bypass will be built over a four-track stretch where the Red, Purple and Brown lines currently intersect at Clark junction. The existing configuration requires Red and Purple line trains to stop and wait for Brown Line trains to cross. The CTA said that results in delays as long as three minutes for more than 40 percent of weekday trains - affecting about 150,000 riders. The bypass will carry northbound Brown Line trains over Red and Purple line trains to remove the current conflict, officials said. The elevated bypass will then slope downward before the Southport station to rejoin the existing tracks, officials said. (Courtesy of CTA) (HANDOUT)