The tifon is the standard pneumatic horn used on locomotives and electric trains across Russia and the former Soviet Union, designed to be heard long before a train arrives. Clips tagged with the ER2, one of the most common Soviet commuter trains, circulate among railway enthusiasts who record and compare horn tones. Online the recording has become a go-to train horn for soundboards, shared by spotters, simulator players and editors who need a single powerful blast that reads instantly as a real railway warning signal.