Trains will begin a month of test runs on the newly constructed Foothill Gold Line tracks in Irwindale, Azusa and western Glendora Monday, authorities said.

The nightly test runs will be conducted between 4 p.m. and 1 a.m. weekdays, Foothill Gold Line spokeswoman Lisa Levy Buch said in a written statement.

“To limit noise, the grade crossing bells will be disconnected during this testing period and the train operators will use their optional “quiet-zone” horns which sound more like buzzers and are commonly used in residential areas,” Buch said.

With the start of train testing, extended construction hours in the affected areas will cease, officials said.

The testing is scheduled to continue through early August, but may continue longer than scheduled on an as-needed basis, officials said.

Similar testing has already begun farther west on the line in Monrovia, Duarte and Irwindale.

Now that the tracks are becoming active, Foothill Gold Line officials reminded residents to use appropriate caution, obey all warning signs and never go underneath lowered crossing gates.

The new commuter train line between Pasadena and Azusa is scheduled to be completed in September.

For more information, visit. www.foothillgoldline.org.