[4] The route connects downtown San Diego with the cities of Lemon Grove, La Mesa, and El Cajon.

Service began on March 23, 1986, originally as the East Line and initially operated between downtown San Diego and Euclid Avenue.

[12] To accommodate the new Siemens S70 models so that they could be used on the line, Trolley stations needed to undergo renovation, although this was done over a period of time to prevent the disruption of operation.

[14] MTS says the change should help improve on-time performance of the Orange Line and relieve train congestion at Santa Fe Depot.

The station, which opened April 29, 2018,[19] serves as a layover point for Orange Line trains three blocks to the east of America Plaza.