Does the soothing sound of birds, water or breeze help you keep calm?
Drown out all the other sounds by plugging in your earphones and listen to the calming sounds of a beach, rushing water, alowing winds, city streets, cats purring, train sound, water sripping and so on. Even if you are just on the train, and feeling on the brink of annoyance, listening to this will calm you down and make your mood better.