The J train is a subway line in the New York City transit system, operated by the MTA. It runs from Broad Street in lower Manhattan to Jamaica Center in Queens, covering a distance of approximately 13 miles. The line primarily serves neighborhoods such as Williamsburg and Bushwick. The J train is part of the BMT division and operates on a mix of elevated and underground tracks. It typically runs every 8 to 12 minutes during peak hours, providing essential transportation for commuters and residents in the areas it serves.