The E353 Series is a JR East electric multiple unit that entered service in 2017, primarily on Chuo Main Line limited express services such as Azusa and Kaiji. Although this upload’s earlier description calls the clip a Narita Express horn, that service is generally associated with different rolling stock, so the exact recording context is uncertain. Online, short Japanese train horn recordings are commonly shared in railfan compilations, simulator edits, station videos, and transit sound collections because they provide an immediately recognizable railway cue.