(b) When chlorine trifluoride is transported in two steel cylinders mounted within a rail boxcar, which DOT warning labels should be affixed to the exterior surfaces of the cylinders? (c) Which DOT placards should be affixed to a railcar in which the two steel cylin ders of chlorine trifluoride are transported to their use-destination? (d) Identify the markings that DOT requires on the exterior surface of the cylinders used to transport chlorine trifluoride. (e) When chlorine trifluoride is offered for transportation by rail, what shipping description does DOT require the shipper to enter on the accompanying waybill? (f) Determine the initial isolation distance and protective-action distance recom- mended by DOT for use by emergency responders when they arrive at the scene of transportation mishaps involving a slow leak of chlorine trifluoride from a 5-pound (2.3-kg) steel cylinder during daytime hours.