One of the biggest employers in the Watertown area is celebrating 125 years of existence. A luncheon was held Tuesday honoring the legacy of the New York Air Brake. The facility currently employs 575 people. During Tuesday’s event, officials with the plant’s parent company says the ability to keep up with technology has allowed the Air Brake to continue on into the 21st Century. They manufacture braking systems and train control systems for the freight train industry.