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Automatic Train Control and Signals

L.K. Comstock has extensive signal system project experience spanning from early mechanical relay-based designs to modern solid-state flexible block systems and communications-based train control (CBTC). Our project history, featuring dozens of successful installations, demonstrates our broad capabilities to complete turnkey installations for new transit systems as well as upgrades and retrofits for existing systems.

L.K. Comstock provides a broad scope of services, from design through start-up.  Throughout every project, we collaborate with signals systems consultants and manufacturers to ensure design compatibility, site application engineering and coordination with existing facilities, and comprehensive installation, testing and start-up services.

L.K. Comstock’s experienced project management and field staff include signal engineers and field engineering specialists as well as CAD, CPM planning and cost management professionals. These professionals bring a detailed understanding of the systems to each project, from coordinating hardware acquisition with suppliers, to developing detailed schedules, to applying thorough field installation sequences.

L.K. Comstock has particular expertise working in operating system environments, where coordination with operations personnel, planning and preparation for track-side access are critical elements in the success of the project.

L.K. Comstock has worked with every major train control and signal systems supplier and maintains a close liaison to ensure familiarity with the latest state-of-the-art systems and components.

Featured Projects 
Sound Transit
Metro Transit (Minneapolis)
Representative Experience 

Check our our representative project experience on ATC and signals projects throughout the United States.

Project Experience 

L.K. Comstock has completed ATC and signals projects on more than 20 different transit properties over the past 20 years. Our work includes the first Solid State Interlocking and communications-based train control technology (CTBC) projects piloted on the New York City Transit Authority.