The signal system at the Bergen Street subway stop in Brooklyn is tormenting riders.

Day after day, the equipment keeps failing. Trains are snarled. Commutes are turned upside down.

As subway officials try to rescue New York City’s system from crisis, they are focused on upgrading the antiquated signal system, parts of which date to the 1930s.

But the faulty signal equipment near the Bergen Street station on the F and G lines was installed in 2006, proving sometimes even newer hardware can break down.

Subway officials believe the recent problems stem from what is known as an interlocking, the mechanism that controls train movement where multiple tracks come together. They are investigating along with the manufacturer, Thales, a French transportation company, to determine what went wrong.