From CFD Media:

311 alarm 3600 S. Homan abandoned warehouse or factory building water problem railroad traffic stopped for hose lay

This is red x building vacant dangerous. Hose wagon responding requesting deluge unit

Building has lots of material inside heavy fire load. Engines operation inline for distant water

Building unsound roof trusses now sagging

extra alarm fire in Chicago

CFD media photo

extra alarm fire in Chicago

Deluge unit “little moe “on scene setting up “. CFD media photo

extra alarm fire in Chicago

This is large volume nozzle unit can deliver 5000 gal per minute. CFD media photo

extra alarm fire in Chicago

Heavy fire still in progress. Building beginning to fail. CFD media photo

extra alarm fire in Chicago

Little moe high volume unit in operation on 311. Chicago FD Media photo

extra alarm fire in Chicago

CFD media photo

extra alarm fire in Chicago

CFD media photo