Dunno if this is actually radio related, but thought this community might know something about it.
I was walking down a stretch of railroad that I haven't explored before when I happened across this metal sign nailed down to the tracks.
It's pointing toward the nearest railroad crossing and says "790Hz". Is this a radio frequency one could listen on and hear when the train is passing by? Or something else? I don't know anything about trains
You should check out this patent. When the train goes over a special section of track, it will trigger the signal at the nearby crossing
The technology that's possibly in use on the railway is:
Did you tune in?
Maybe a wiki/Balise?
But that looks passive & without electronics, just a plate bolted down?
Maybe it is just a simple sign about the signaling frequency (of some nearby wires) to the nearby crossing or station?
Definitely not an RF frequency, much, much too low.
Might be some wire based signalling for a railway switch or semaphore or so.
Perhaps ask in a train community?
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