By following this tutorial, you can learn how to easily make a train whistle sound using only your hands. You can replicate the sound of a train whistle by simply folding your hands and adjusting for the airflow as you blow on your thumb knuckles. This is a very easy trick to learn, so with just a little practice, you can use the train whistle to play with your kids, call them to dinner, etc. It's a great trick for somebody who has difficulty with conventional whistling.
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