The Tempe Fire Department said Friday that two contract workers were hurt when a chemical they were transporting from a freight train car that derailed earlier this week leaked from a hose. The tank car was carrying cyclohexanone, a pale and oily liquid that is toxic and flammable. As a worker was disconnecting a hose from the car, he heard a loud bang and liquid from the hose sprayed his face. Another worker was sprayed in the chest area. The worker who was sprayed in the face was conscious and sent to a burn unit, and his condition is serious but not life-threatening. The other worker was treated on site and declined hospitalization. A 102-car Union Pacific Railroad freight train traveling from Tucson to Phoenix derailed Wednesday morning as it traveled on a century-old bridge that spans the man-made Tempe Town Lake.