Synthesizer horn and many trains departing the morning rush at Umeda Sta, Midosuji Line,Osaka, Japan

The Midōsuji Line (御堂筋線 Midōsuji-sen) is a rapid transit line in Osaka, Japan, operated by the Osaka Municipal Subway.
The Osaka municipal subway horn has high reputation from users such as "pleasing" and "healed" with a unique tone like pipe organ.
It is highly likely that the sound is composed of chords of "EAC #" = musical score = in recent years, it was found by investigation by a subway operator.
Because the score was missing, the subway operator has customized it based on the recording.
It was a mystery of a subway operator over a quarter of a century.
Air whistle is mainstream for horn.
However, at the municipal subway where the train always sounds when entering the station home or even when departing to inform the workers in the tunnel, "Air whistle surprises the customer by being too noisy," said the synthesizer We adopted "electric whistle" which is comfortable to hear with sound.
According to a subway operator, this sound was composed by a male staff member who was a music hobby in 1989 by a synthesizer.
However, this official has already retired and there is no musical score, and a new type of vehicle has given a manufacturer a recording sound source more than a quarter century ago to the manufacturer and made a special order.

In 2018, the Osaka Municipal Subway was privatized and became the Osaka Metro.

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