This video was posted this past summer, a few months after I went in to the Budd Plant in North Philly. To this day, this is one of my favorite spots I've ever had the pleasure of going into. The scale is massive and the whole thing seemed like an unending labyrinth. In some ways, it reminded me of being inside Michigan Central Station (maybe because I was alone).
Anyway, there's some really good commentary here from a former worker.