Relaxing sound of running electric trainset ER22 / звук ЭР22

This is one of a series of videos designed for various needs:- as a calming sound to play in the background while studying or as a soothing sound to play while you sleep. These videos can be used for many relaxation requirements, let me know how you use this video. With each video there will be a tip to help you with your studying or how to achieve a relaxed sleep.
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