Not sure how helpful this info is as I haven't ridden the UPNW line frequently in years, but I did ride it last Friday. On the spur leading towards Elston, there were 5 empty gondolas. That to me said they were waiting to be moved to General Iron. However, that was before I read the updates on this thread. Corroborating that G.I. hasn't used rail shipments recently is the barge I saw this past Monday. My office is directly on the south branch of the Chicago River, and a barge floated southbound full of shredded scrap metal. I don't know of any other scrap yards north on the river besides G.I. I'll see if I can post there photos shortly.