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This carriage has a "flat" - uneven wear on the steel tyre on one of the wheels. That is the rhythmic tapping which can be heard throughout the video when the train is moving.
![【4K前面展望】みやこ路快速（奈良～京都）[4K Cab View] Miyakoji Rapid Train](http://i.ytimg.com/vi/v4MCtc-FT5U/mqdefault.jpg)
This carriage has a "flat" - uneven wear on the steel tyre on one of the wheels. That is the rhythmic tapping which can be heard throughout the video when the train is moving.