Aldridge Builds: Airport Transit Systems

San Francisco Air Train System Expansion & Control Upgrades

Aldridge was contracted to replace the existing people mover control system with radio-based train controls along the entire existing elevated guide-way. In addition, the guide-way is being extended 1,750 feet to connect to a new rental car facility and a new hotel station. Aldridge scope includes furnishing and installing: fiber optic cable with associated distribution boxes; control cable; Cat5E cable; cable trays with covers; and guide-way lighting fixtures. Crews are working to install over 22,000 LF of power and signal rail and guide-way switches. Additional scope includes modifications and additions to: the central control system; blue light system; intrusion alarm system; public address system; SCADA system; and platform door system. Modifications to the existing system are performed at night during 6-hour work windows on live track while new construction on the extension is executed during normal work hours. Construction is expected to be complete by Fall 2020.

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O'Hare Airport Transit System (ATS) Expansion & Modernization

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This project provides the City of Chicago with a new, robust, dependable, wireless train control system and 36 new electric train cars. The 14,000-foot elevated guide-way was extended an additional 2,000 feet in order to reach a new multi-modal facility. The facility provides long-term parking spaces, rental car facilities, and access into and out of the airport by shuttle, regional bus, or commuter train. Aldridge scope includes: a new traction power substation; installation of traction power duct banks to provide power to the new power rails; a facility power substation that provides power for the new train control equipment along the extension; multiple traction power switching stations; new UPS equipment; guide-way heating; and emergency lighting. Also part of the overall project is a new maintenance and storage facility that includes two new maintenance tracks and an additional maintenance and recovery vehicle storage track. These tracks require the same train control equipment, communications, guide-way heating, and traction power as the elevated guide-way tracks.

Aldridge utilized prefabrication for many components of the scope. Assemblies were created in an off-site controlled facility, streamlining the installation work performed on the elevated guide-way. Construction is expected to be complete by Fall 2019.

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