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At a great many such crossings at grade, the junior railroad must pay for the maintenance of an "Automatic Interlocker". The senior road then maintains it. Commonly, neither dispatcher has any control as the automatic interlocker grants the route to the first train to activate an approach track circuit - sort of first come fisrt serve. Sometimes electric controls are arranged so that a dispatcher on the senior road can override this - but usually not. At such crossings where the dispatcher is not in control, there is usually an override mechanism of some sort available to the train crews just in case an approach gets stuck or a train is switching on the approach but not intending to cross. When activated the original route is cancelled, and after a several minute safety time out - a new route is automatically set up for the other railroad. hope that helps RmC
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