The Standard Light Rail Vehicle (SLRV), currently being produced in quantity for Boston and San Francisco, has been designed to stringent interior and wayside noise criteria. The articulated joint in the carbody required an unusual design to reduce acoustic flanking paths. The average carbody transmission loss exceeded 30 dBAfor the roof and sidewalls and was 35 dBAfor the floor. The carbody design resulted in an interior noise level of 75 dBAat 40 mph, whether operating at grade or underground. Equipment noise levels were generally below 65 dBAat a distance of 15 ft from the track centerline. Acoustically damped wheels eliminated squeal on curves and resulted in 40‐mph pass‐by noise levels of 70 dBAat a distance of 50 ft from track centerline. Considerable appeal is expected by transit patrons, when the cars are introduced into revenue service.