@@syake7804likely just motor/gearbox design style. Not all modern traction is silent. It depends on the design Infrustructure. However its designed likely allows it to operate at max efficiency with a bi product of more noise. It just depends I guess.
@@shuhima233we need this more. It's no secret even likely to the manufacterers, that people actually like the gearbox/motor sounds its just the excessive track noise makes people assume that the entire train is the issue. Those things can be rectified to hit a moderate noise. Motors on the other hand. Unless they are usper loud, i don't know anyone that dislikes them. They are unique. It's like how cars have cool sounds , but for a train .