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I have a new question. I am wondering why Trains stop before decending down a steep grade (mountain grade). I live near the Horseshoe Curve, right atop the Gallitzin Tunnels in PA on the NS 3 track mainline. I watch trains all the time. I am aware they stop to cut helpers off, but most trains go right on through with the helpers still attached to help slow down on the decent. So what I am asking, what are the Engineers/Locomotives doing when they stop briefly, at the peak of this Mountain Grade ? ? ?
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