Ahh, that makes sense. Thanks for the assist!
Comment on [Question] Metal Sign on Railroad Says "790Hz"
sketchyenchantment@sh.itjust.works 4 weeks ago
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
rudyharrelson@lemmy.radio 4 weeks ago
in_my_honest_opinion@piefed.social 4 weeks ago
790hz is the switching signal, as the contacts corrode the resistance increases so they have to be tested on a schedule.