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Time Lapse Video: Mega-Ton Beam Placement Over Rose Canyon for Future Mid-Coast Trolley

April 19, 2019 - SANDAG reached another significant construction milestone as Mid-Coast Trolley crews set twelve 140-foot-long concrete girders, or beams, to form the flyover structure for the future extension of the Blue Line Trolley.

The flyover will allow the Trolley to travel over preexisting heavy rail that runs along Rose Canyon.

The flyover will be a vital link for the light rail, which will run beside the heavy rail to the east between the Old Town Trolley Transit Center and Rose Canyon, and to the west from Rose Canyon to just south of Nobel Drive, where it will cross Interstate 5.

As shown in this time lapse video, crews hoisted the 81-ton girders using a crane and set them on columns that run along the canyon. The girders were cast in Riverside County and transported on special industrial trucks built to withstand extra-heavy loads.

This work was conducted during last weekend’s absolute work window, or AWW, where all rail travel was postponed.

The Mid-Coast Trolley Project will extend Blue Line Trolley service from Old Town north to the University City community, serving major activity centers such as Mission Bay Park, the VA Medical Center, UC San Diego, and University Town Center. Nine new stations will be constructed. Major construction work began in 2016, with service anticipated to begin in late 2021.

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For media inquiries, please contact the SANDAG Public Information Office at (619) 699-1950 or