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That is defined by an agreement between the two roads. It is usually based on which railroad was there first, i.e. the road at that location first controls the crossing. Since most railroad were built many years ago the establishment of who controls an interlocker can go back decades. As for day to day operation, train classes tend to dictate right-of-way to the controlling road. In other words, if the controlling road were NS and an Amtrak train approached on CSXT, the Amtrak train would have priority over any NS train of lesser class. When two trains of the same class approach, it's up to the dispatcher to make the best move depending on conditions. <br />Regards, and have a safe day. gdc
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