If dreamed you that you catch up with the train leaving you, then in reality you will be irritated by rashness of acts of other people. Having seen such dream, try as far as it is possible, to rely on own forces in achievement of the planned purposes. If you nevertheless managed to catch up with the train, then in real life you will manage to achieve the object set by you. The dream in which you see the close friend on the street and you try to catch up with it, means that you got into very ambiguous situation and are in great need in support and council.
Be sure and keep any other thoughts out of your mind before drifting to sleep as a cluttered mind can decrease the chances that you will remember your dreams upon waking. Also, focusing on remembering your dreams upon waking in the morning is another very important thing. This sounds very easy, but is often hard for some to do. Interpret a dream by "dictionary dream of interpretation"
When you very first wake up, simply think about your dreams. Don't allow your mind to drift off to other things, just lay there and think about the things you dreamt about the night before - dictionary dream meaning.