In the picture, there are wires dangle over the R/R Tracks. As a kid, when we took trips we went by train. I would notice sets of these type wires hanging over the track just before an overpass that crossed the tracks. What was the proper name for them? What was the purpose of these wires? Was a height indicator of some type? If so, wouldn't the train be traveling to fast to stop if it was too tall. Thanks for your responses.
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