The San Diego Metropolitan Transit System (MTS) is the transit bus and rail service provider for southern San Diego County, which includes approximately 570 square miles of the urbanized areas of the county, as well as the rural parts of East County.
MTS is one of the oldest transit systems in Southern California, with predecessors dating back as early as the 1880s. Service is operated on three light rail lines and ninety bus routes by MTS subsidiaries San Diego Transit Corp., San Diego Trolley, Inc., and under contract by private operators.
MTS also owns the assets of San Diego & Arizona Eastern Railway Company, which owns 108 miles of track and right-of-way, and San Diego Vintage Trolley, Inc., a non profit corporation established to restore historic trolley vehicles. MTS’ Americans with Disabilities Act (ADA) complementary paratransit service is MTS Access.