The tank car of a train rolls past the camera. A train engineer directs the cars in a train yard. Two cars link up and join several others in a train. The train rolls through an urban area, past an Exxon sign. A tanker truck drives through a city. Another truck drives on a crowded freeway. Tank trucks carrying gasoline and liquid flammable gas drive through a city. A tank truck drives to a refinery. A man gets out of the truck and checks the back.