Same site, picture before the explosion. We are on the West side, because the railroad tracks are between us and the plant. The road is to our left and curling away, which puts us on the South side. We can see the tree in the google picture on the mid-left.
There appear to be NO railcars on the track. At all. It actually appears to be the FAR building on fire. Not the near building. The building I was speculating as the OFFICE building. The building TO THE WEST of the Office building is what we are speculating is the dry fertilizer storage building. Yes? Wind is to the North? Smoke is going to the North to the very large, round storage tanks. We do not know what is in them yet. Earlier reports said there was a grain company and a fertilizer company on the same site. We have suspects for the fertilizer building and the ammonia storage tanks. We have not identified the grain storage. Are these the grain storage tanks?
You need to look on Google Earth at this site. The building that is burning is the one closest to the tracks as you can see its makeup better in GE. The office/scale house is to the far right out of this photo. There are platform scales on the street side of it. All the grain bins appear to have been empty as they are flattened like stepping on a tin can. The large round storage tank appears to me to have been used as a flat storage building as there is a forklift still sitting on the pad in one of your photos. That tank is an old oilfield storage tank. There many around the west that have been converted for other uses such as grain storage. They are made up of smaller bolt together panels. You can take out enough of the panels to make an egress point without losing too much structural integrity.