CPTM 3000 series - Brazil's singing inverter

[Socimi]

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This is the 3000 series of Sao Paulo urban railway network (CPTM), maufactured by siemens in 1998, using a similar inverter to those of the Keikyu 2100 series.

It was the first Brazilian train with an inverter.

 

https://pt.wikipedia.org/wiki/TUE_Siemens/Mitsui/SGP_-_Série_3000_(CPTM)

 

An H0 scale model of this train has been relased by Brazil's only model railway manufacturer, Frateschi.

 

http://www.frateschi.com.br/web/trens-metropolitanos/?lang=en

Edited October 1, 2017 by Socimi

[Kiha66]

That's really neat, I wonder if the output frequencies of the VFD were also chosen for their sound.  We use the technology a lot on ships for better efficiency when running motors at less than full load, but most of ours just make annoying whines rather than pleasant musical sounds.