steam whistles are said to be one of the best sounds in the world steam whistles were invented in the 1810s and first used on locomotives in the 1830s as a warning device they're used in factories to Signal shift changes on ships and in music such as organs the steam whistle has a few main parts the valve the bowl plate stud Bell and the case of a chime whistle Chambers when trains approach a Crossing they use a two long one short one long signal also Morse code for the letter Q which is a subject for another video railroads often made their own whistles competing with each other for the most distinctive and sounds which is why