On Tuesday, February 26, 2002, at approximately 4:50 a.m., Chicago Transit Authority (CTA) Green Line train run 2 struck two signal maintainers who were working near tower 18, which is on the section of the Chicago Loop that is above the intersection of Lake and Wells Streets in Chicago, Illinois. The Loop is elevated, and one maintainer fell from the structure, landing on a parked car and then the street. Seriously injured, he and the other maintainer were taken to a local hospital by ambulance. At the hospital, he was admitted for further treatment; the other maintainer was treated and released. At the time of the accident, it was dark, the skies were cloudy, snow was falling lightly, and the temperature was 36° F.