Orange Line (San Diego Trolley)

Orange Line

Company type	Light rail line
Industry	Public transportation
Founded	March 23, 1986 (1986-03-23)
Area served	San Diego, Lemon Grove, La Mesa, El Cajon
Key people	San Diego Trolley, Inc.
Products	Light rail transit service
Parent	San Diego Metropolitan Transit System

Orange Line

The Orange Line is a 17.1-mile light rail corridor within the San Diego Trolley network, managed by San Diego Trolley, Inc., a subsidiary of the San Diego Metropolitan Transit System (MTS). This line links downtown San Diego with the municipalities of Lemon Grove, La Mesa, and El Cajon. Among the five lines in the system—including the Blue, Green, Copper, and Silver lines (the latter operating heritage service on weekends)—the Orange Line experiences the lowest passenger volume, carrying 10.9 million riders during fiscal year 2014.

Operating with three-car train sets on standard gauge rails, the line reaches speeds up to 55 mph and serves 18 stations along its path. Moreover, during nighttime hours, freight operations by the San Diego and Imperial Valley Railroad utilize the Orange Line’s tracks east of the rail yard near 12th & Imperial Transit Center to provide service to El Cajon and Santee.

History

As the second route introduced in the San Diego Trolley system, the Orange Line commenced service on March 23, 1986. Initially branded as the East Line, it ran between downtown San Diego and Euclid Avenue. The route gradually extended: reaching Spring Street in May 1989, El Cajon Transit Center in June 1989, downtown Bayside by June 1990, and ultimately extending to Santee Town Center in August 1995.

In 1997, it was renamed the Orange Line. With the introduction of the Green Line in July 2005, service between Gillespie Field and Santee Town Center was replaced by the Green Line.

2012 realignment

On September 2, 2012, a system-wide restructuring shortened the eastern end of the Orange Line to terminate at El Cajon Transit Center, discontinued Bayside service, and redirected its western endpoint to Santa Fe Depot in downtown.

Trolley Renewal Project

To accommodate new Siemens S70 low-floor vehicles on the Orange Line, stations underwent staged upgrades designed to maintain continuous operation. Following completion of these renovations, S70 trolleys began service in January 2013, with the overall renewal project finalized within that year.

2017 and 2018 realignment

On July 11, 2017, adjustments were made to shift the Orange Line’s western terminus from Santa Fe Depot to America Plaza to enhance punctuality and ease congestion at Santa Fe Depot. To further reduce crowding at America Plaza prior to the Blue Line’s Mid-Coast Extension toward UC San Diego and UTC, MTS developed Courthouse station as a new western endpoint for the Orange Line. Opened on April 29, 2018, Courthouse features a single platform and track located on C Street between State and Union Streets. It functions as a layover facility positioned three blocks east of America Plaza. Simultaneously, service was extended one stop north to Arnele Avenue to provide a more efficient layover location than the heavily trafficked El Cajon Transit Center.

East County Connector Initiative

With the anticipated completion of the East County Connector in 2024, the northern endpoint of the Orange Line will be relocated. This project involves installing a third track at El Cajon station to accommodate Green, Orange, and Copper Line vehicles.

In May 2024, MTS introduced the East County Connector—subsequently designated as the Copper Line—to take over operations from the Green Line between El Cajon and Santee. This change was implemented to resolve delays caused by a single-track constraint near the line’s terminus, which had impacted Green Line punctuality. The Copper Line began service on September 29, 2024, coinciding with the Orange Line’s northern terminus being shortened to El Cajon station.

Stations

Station	Location	Connections
(limited service)	Core, San Diego	Template:MTS icon Template:MTS icon
		Template:MTS icon Template:MTS icon
		Template:MTS icon Template:MTS icon Template:Bus icon MTS: Template:SDMTS route, Template:SDMTS route
	East Village, San Diego	Template:MTS icon Template:MTS icon Template:Bus icon MTS: Template:SDMTS route, Template:SDMTS route, Template:SDMTS route, Template:SDMTS route, Template:SDMTS route, Template:SDMTS route, Template:SDMTS route, Template:SDMTS route, Template:SDMTS route, Template:SDMTS route, Template:SDMTS route, Template:SDMTS route, Template:SDMTS route
		Template:MTS icon Template:MTS icon Template:Bus icon MTS: Template:SDMTS route, Template:SDMTS route, Template:SDMTS route
		Template:MTS icon Template:MTS icon Template:MTS icon Template:Bus icon MTS: Template:SDMTS route, Template:SDMTS route, Template:SDMTS route, Template:SDMTS route Template:Rint Greyhound Lines Template:Parking symbol Park and ride: 1,020 spaces, paid parking available
	Grant Hill, San Diego	Template:Bus icon MTS: Template:SDMTS route

(Stations continue in a similarly succinct format)

Potential San Diego International Airport Extension

In January 2013, discussions between San Diego Mayor Bob Filner and SANDAG considered extending trolley service to San Diego International Airport. Since 2009, SANDAG has been evaluating the feasibility of prolonging the Orange Line from downtown San Diego along N. Harbor Drive to reach the southern side of Lindbergh Field, including possible intermediate stops. However, no official timelines for commencement or completion have been determined for this proposed extension.