On Monday April 13, 2015 CSX Q204-12 derailed while entering the siding in O'Fallon, IL. Between 7-9 cars loaded with pickup trucks derailed off the tracks, but didn't fall on their side. I didn't know a train derailed in O'Fallon, IL. The derailment must've happened between 11am-12pm while I was on my way to my girlfriends house to go fishing. But like I said I didn't know a train derailed while going into the siding until I heard a train crew tell the CSX Dispatcher that 7-9 cars are on the ground. UP 8932 was the leader on CSX Q204-12. Later on that afternoon my girlfriend and I went to the derailment sight to get pictures and video of the RJ Corman crew cleaning up the mess. An eastbound CSX train which was CSX K803-12 which is a Phosphate or Molten Sulfur train was tied down west of O'Fallon, IL. They got done cleaning up the derailment around 10:30pm. The first train to run was the CSX K803-12 which probably came through O'Fallon around 11:30 that night and CSX Q204-12 which was the train that derailed in O'Fallon, IL changed to X204-14. CSX X204-14 probably left O'Fallon around 4am. That was my first time seeing a derailment in person.