Why does a departing train sound like a piano?
(2 votes)
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As a supplement to the other contributions:
The locomotive manufacturer can freely select the alternating current frequencies that are used when starting up.
In the locomotives mentioned (ÖBB 1016/1116, DB 184) the frequencies were deliberately selected in accordance with a conductor to generate a nice acoustic experience.
In the succession model ÖBB 1216, the frequencies are again “played” continuously (as in many other vehicles).
It is said that some poorly-placed train station residents are perceived as less disturbing than the conductors (this reason for the departure from this nice feature was to be read in a specialist forum; I don’t know if it’s true).
Hello,
the ÖBB left their new three-phase locomotives, the TAURUS series,
when starting with a “melody”.
The reason was the unpleasant noise, the three-phase motors, when starting.
This was taken over by DB Series 184. The same ELoks.
And that just made “school” so that you took over with other rail-bound drives.
Hansi
Hello
The sounds are generated by the control of the power converters, the ÖBB state. These ensure that the current from the overhead line is converted to the three-phase motors of the Taurus locomotive. A tone is produced which is raised stepwise.
The frequency changes in whole and half-tone steps over two octaves. According to ÖBB, the fact that the frequencies sound like a conductor is full intention. Because it would sound more pleasant for the human ear than other melodies.
https://wien.orf.at/v2/news/stories/2863787/index.html
Greetings HobbyTfz
Here it is very nicely explained: https://www.youtube.com/watch?v=nnnXSYQwV5gk