I ve run fastrack on carpeting and it s queiter but to me carpet still lets the sound to escape from under the track.
Carpet noise fastrack.
Homasote absorbs much of the sound that gets through the carpet padding.
To eliminate all noise look for a rating that is 75 or higher.
Finally rather than putting fastrack right on top of a wooden table put a layer of homasote in between the track and the table.
One trick with fastrack is carpet with a medium high nap it fills the echo chamber base and really cuts down the noise.
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.
In most cases you need to use an underlayment specifically designed for noise reduction between the carpet and the standard pad.