J Line (Los Angeles Metro)

The J Line (formerly the Silver Line, also designated as lines 910 and 950) is a bus rapid transit (BRT) route in Los Angeles County, California, operated by Los Angeles Metro. The 38-mile (61.2 km) route runs between El Monte, Downtown Los Angeles, and the Harbor Gateway Transit Center, with select trips continuing to San Pedro. It is one of two lines that comprise the Metro Busway system.

The J Line primarily operates along two dedicated busways: the El Monte Busway and the Harbor Transitway, both of which are grade-separated corridors built into the Southern California freeway system. Service began on December 13, 2009, as part of the conversion of the corridors from high-occupancy vehicle (HOV) lanes to high-occupancy toll (HOT) lanes under the Metro ExpressLanes program. Revenue from tolls supports the operation of the line and the maintenance of its stations.

As J Line buses travel along the El Monte Busway and the Harbor Transitway, they serve stations built into the center or side of the roadway. There is a 3.6-mile (5.8 km) gap between the western end of El Monte Busway and the northern end of the Harbor Transitway in downtown Los Angeles, where J Line buses travel on surface streets, making a limited number of stops. Along the route, buses serve several of the region's major transportation hubs, including El Monte station, Union Station, 7th Street/Metro Center station, Harbor Freeway station, and the Harbor Gateway Transit Center.

In 2020, the line was renamed from the Silver Line to the J Line while retaining its route numbers and the color silver in its square icon as part of renaming all Metro lines.