In this photograph (Photo ID: 404520) of the same place, but with a longer train, the railroad in a horseshoe seen better!: http://www.railpictures.net/viewphoto.php?id=404520&nseq=38
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From mountainous areas to sea level the grades this train passes through must be extreme. It is my understanding that concentrated sulfuric acid is basically non-reactive in the absence of water and can be pumped through plain carbon steel with very little reactive effect. I can imagine that if a leak developed on one of the tank cars very little would happen in this super dry climate.
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