Class 803003 Lumo sound at Darlington

[JasonAtShildon]

Can anyone please tell me why this class 803 unit 003 made this strange low frequency like sound when passing darlington (down main line) not to be confused with the clickety clack sound

the video linked below shows the sound I’m referring to. (this video was recorded, rightfully posted and is owned by me) from YouTube shorts

 

[fgwrich]

I’m not hearing anything unusual in that, the electrical sound is the transformers.

 

[JasonAtShildon]

I’m not hearing anything unusual in that, the electrical sound is the transformers.

Oh what about that hum sound that it’s making ?