In most cases you need to use an underlayment specifically designed for noise reduction between the carpet and the standard pad.
Carpet noise fastrack.
I also used 2 layers of snow blanket on my xmas layout and it helps i ve tested carpet padding on my layout with some of the track on the foam board and some on the carpet padding and the difference is night and day.
Finally rather than putting fastrack right on top of a wooden table put a layer of homasote in between the track and the table.
To eliminate all noise look for a rating that is 75 or higher.
Homasote absorbs much of the sound that gets through the carpet padding.
Even after doing these things fastrack tends to be a bit louder than traditional track but it makes the noise tolerable.
Fastrack will never be the quietest track but you can do things to help with the noise level.