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Rumors, myths, urban legends??
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the name of the game when it comes to airbrakes is adhesion. to much air pressure used in the airbrakes the wheels will lock up and as a result the wheels will slide. to little air pressure and you will not get enough force out of the brake shoes to stop the train. as you can imagine a 100 years ago there was a lot of trial and error that accured when the railroads tried to get the air pressure right. so i would say yes this did happen, just not 300 years ago.
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