United States Department of Transportation
i
Alaska Railroad Collision Avoidance System (CAS) Project: Research Results
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2009-08-01
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By Tse, Terry
[PDF-225.42 KB]
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TRIS Online Accession Number:01156909
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Abstract:The Alaska Railroad (ARRC) is developing a program to design, develop, and implement a communication-based vital positive train control (PTC) system called collision avoidance system (CAS). This system will ensure an environment in which the safety of ARRC passenger and freight train operations in centralized traffic control (CTC) and non-signalized direct traffic control (DTC) will be significantly enhanced as well as providing for efficient train operations. The proposed safety enhancements include: (1) Generating and delivering safe mandatory directives, (2) Fail-safely enforcing authority limits to prevent train-to-train collisions, (3) Fail-safely enforcing speed restrictions to prevent overspeed derailments, (4) Protecting roadway workers within their assigned limits from incursions, and (5) Protecting train movements from a switch aligned in the wrong position. The CAS system will be implemented system-wide on the ARRC rail network including 65 miles of CTC and 435 miles of DTC territory; the network is a single main-line rail system that has both freight and passenger traffic concurrently. All controlling locomotives will be equipped with vital onboard computer equipment and two data packet radios for both low (44 MHz) and high (161 MHz) band radio frequencies.
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