Attention CTA riders: Four busy train lines in the Loop and downtown will be shut down this weekend. According to a release, the CTA will be replacing "critical track switching equipment at the Tower 18 junction" at the intersection of Lake and Wells, which requires a temporarily suspension of Loop elevated trains on the Brown, Green, Orange and Pink lines. Tap the 🔗 to learn more http://nbcchi.com/3MfMauN #cta #ltrain #chicagotransit #chicagoweekend | NBC Chicago