A Line (Los Angeles Metro)
The A Line (formerly, from 1990 to 2019, and colloquially known as the Blue Line) is a 48.5-mile (78.1 km) light rail line in Los Angeles County, California. The A Line runs east-west between Azusa and Pasadena, then north-south between Pasadena and Long Beach, via Downtown Los Angeles. The A Line is currently the longest light rail line in the world.
The A Line is the oldest of six lines in the Los Angeles Metro Rail system, operated by the Los Angeles County Metropolitan Transportation Authority. The original Blue Line segment from Long Beach to Downtown Los Angeles opened in 1990, using much of the original right-of-way of the Long Beach Line, a former Pacific Electric interurban line.
The A Line's current Azusa–Long Beach service was introduced in June 2023 with the opening of the Regional Connector, incorporating the Union Station–Pasadena–Azusa portion of the former Gold Line.