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There are all different kinds of interlockings. Lots are First Come First Serve Automatic interlockings, where the first railway to get to the signal is the one that gets the permissive signal, and the other railway has to wait. There are also different kinds of manual interlockings where one railway always has priority, and the other railway has to get out and knife a switch so that the signals will turn in their favour, then set the interlocking back for the other railway. There are lots of different ways railway crossing at grades work, it is usually all dependent on the amount of traffic using the crossing, and how long it's been there.
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