I couldn't stop thinking about that old man. You just can't get past them without being asked a question.A now-deleted video posted to YouTube Tuesday night appeared to show footage of the Monday night Blue Line derailment that left more than 30 people injured and ended with the CTA train on the platform escalator and stairs.The post at www.reddit.com/r/chicago/comments/21dwkn/leaked_security_cam details of the incident, but the https://www.youtube.com/watch?v=c8X6b0tcQy8 disappeared quite quickly after the initial posting.