At railroad crossings, what is the mechanism that tells the barriers to raise back up once the train has passed

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At railroad crossings, what is the mechanism that tells the barriers to raise back up once the train has passed

In: Engineering
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The track side barrier mechanism can see the resistance between the tracks as the rail cars pass over them – rail cars keeping them both shorted together as they pass over (the axles in the bogies (axle carriers) create a short between the rails). When this goes away then the barrier will reopen. In addition for some systems. I think there may be other mechanisms as well, but that is the one I know of……..