A $200,000 project to reduce the volume of train horns was completed one month ahead of schedule, Caltrain officials announced Friday.

The project to restore the horns’ distinctive “toots” and “tweets” to a level the public can stand began after numerous complaints dating back to July when the horns were moved from the bottom of the trains back to the top to meet federal regulations. Federal regulations require the horns to produce distinct, separate and sequential blasts and a summer safety inspection revealed the horns were not making the unique “toot” and “tweet.”

Caltrain moved the horns to the underside of locomotives and cab cars in response to previous complaints from the community but had to move the horns back on top of the trains, soliciting a whole new slew of resident complaints.

Now the horns are returned to the bottom of the carriage to help muffle the sound and still keep in line with federal regulations.

Because the horns are directed down at the tracks, the noise that is dispersed into the community has been substantially reduced. To move the horns, the air supply system was redesigned to include a regulator and an air control valve. Each horn was tested, set to the minimum decibel level and tested again before being locked in place, according to a Caltrain press release.

In July, a safety inspection determined the horns were not making the specific blasts required by law and were moved to the top to be in compliance. Those living along the tracks immediately noticed a difference despite the volume being set to the lowest level possible.