What does my dream mean? I woke the whole house up screaming!?

The main aspect of the dream is the intensity of your feelings. The train could represent many things, anything from some threatened situation in your life to a . If you can't relate this dream to something real in your life then there are some unconscious feelings that you might need to explore. Certainly, if this dream should occur again at such intensity you might want to talk to a counselor to explore the possible hidden unconscious content.