Per Federal statute and regulations, PTC systems must be designed to prevent train-to-train collisions, over-speed derailments, incursions into established work zone limits, and the movement of a train through a main line switch in the improper position. Railroads are primarily implementing the following PTC systems in the United States: (1) the Interoperable Electronic Train Management System (I-ETMS), which is the predominant system being implemented by Class I railroads; (2) the Advanced Civil Speed Enforcement System (ACSES II), which is being implemented by most railroads operating on the Northeast Corridor; and (3) Enhanced Automatic Train Control (E-ATC), which is being implemented by six intercity passenger or commuter railroads. Each of these PTC systems must be interoperable, meaning the locomotives of any host railroad and tenant railroad operating on the same main line will communicate with and respond to the PTC system, including uninterrupted movements over property boundaries.[2]
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