Neighbors in path of All Aboard Florida horn blasts press for... | www.mypalmbeachpost.com

We have nine crossing across the FEC (eastern) tracks in Lake Worth. Quiet zones would be in addition to money cities already have to spend to upgrade the crossings, if the city wants a quiet zone. Here's a bit from the article:

The passenger train will be a tenth the length of a freight train and much lighter, but the horn blasts have to be just as long, just as loud. Wayside horns, which are mounted at the roadway and concentrate the noise toward traffic, are recommended for the project to lessen the effect on surrounding neighborhoods, but some kind of horn blast will sound unless cities get quiet zones in place by the beginning of 2016.

This is the "fast" train that will run first - taking passengers from Miami, Ft. Lauderdale and West Palm Beach to Orlando - with no local stops. That service is coming, but will follow establishment of this sort of service.