From left to right, the gray silos help to hide the end of the scene and convey the impression of the tracks continuing beyond, under the mill building behind. This building will span the end of the scene and help to block most of the piping and other garbage behind it. The larger run of silos continues behind the tracks as shown, with the conveyors on top represented by strips of wood right now. A smaller surge bin (shown in black)is at the end of the silos, and a truck loading silo is located to the right of that. The long lower building in the foreground mirrors one in a similar spot at the Port of Albany facility that inspired this, I just mocked it up out of cardboard to get the feel.