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8/2/2021
The San Diego Metropolitan Transit System (MTS) on July 31 marked the MTS Trolley's 40th anniversary with a community celebration.
The MTS Trolley launched in July 1981. The 54.3-mile system registered more than 32 million passengers in fiscal-year 2019, MTS officials said in a news release.
The trolley operates on four lines — Blue, Orange, Green and Silver — and serves 54 stations. The UC San Diego Blue Line opened first as the South Line, operating between downtown San Diego and San Ysidro, California.
San Diego's trolley system represents the first modern light-rail service in the United States, a Siemens Mobility Inc. spokesperson said in an email. Siemens provided the first vehicles used in the trolley system, the spokesperson said.