Why have refurbished Class 373 units lost their iconic motor sound?

[RacsoMoquette]

Yesterday I was travelling from Gare du Nord to London St Pancras International on the 19:11 (9055) which was formed of a refurbished Class 373 set (3027). I stood in the vestibule area upon departure and only herd the occasional extreamly muffled wine which sounded around every minute, however to my massive disappointment the GTO three phase thyristor was not present. Could anyone relay any information why the refurbished units do not sound an audible traction motor? Or was it just the unit I was travelling on.

 

[MrPIC]

Might have had motors out, search YouTube the refurbed ones still sound the same

 

[RacsoMoquette]

Thank you for that valuable information! It is lovely to hear that the refurbished units still emmit the audible traction sound, I think the unit I was traveling on may have had its motors removed.

 

[Flying Snail]

Only the power cars and the bogies on the first and last coaches beside the power cars have motors so there is no reason you would hear anything away from the ends of the train.