It's been a while since I last remember my dream and now that I can still vividly see the 3 main characters of my dream, I might as well see what it could mean.
Dolphins - To see a dolphin in your dream symbolizes spiritual guidance, intellect, mental attributes and emotional trust. The dream is usually an inspirational one, encouraging you to utilize your mind to its capacity and move upward in life. Alternatively, it suggests that a line of communication has been established between the conscious and unconscious aspects of yourself. Dolphins represent your willingness and ability to explore and navigate through your emotions.
Ocean - To see an ocean in your dream represents the state of your emotions and feelings. It is indicative of spiritual refreshment, tranquility and renewal. Alternatively, the dream means that you are feeling empowered and unhindered. You have a positive outlook in life and are not limited by anything. If you are sailing across the ocean, then it signifies new found freedom and independence. You are showing great courage. If the ocean is rough, then the dream represents some emotional turmoil. You are doing your best to handle life's ups and downs.
Train - To dream that you are on a train symbolizes your life's journey. It suggests that you are on the right track in life and headed in the right direction. Alternatively, the dream means that you have a tendency to worry needlessly over a situation that will work out in the end.