 Welcome to the Voice of America's Newswords. Union Pacific Railroad Cars in Los Angeles, California are a target of robbers. Litter These packages were on their way to buyers before they were damaged by criminals. The governor of California called the crimes organized theft. He helped clean up the massive amount of litter from the tracks. Litter is pieces of trash or waste left outdoors by humans. It is one kind of pollution. But litter can also mean something lovely. A litter of kittens, for example, are the newborn cats produced from a single pregnancy.