FILE - In this July 25, 2014, file photo, an oil train moves through the area south of St Paul, Minn. A collapse in oil prices won't derail the railroads’ profit engine even if it does slow the tremendous growth in crude oil shipments seen in recent years. Railroads went from hauling 9,500 carloads of crude oil in 2008 to 435,560 last year, as production boomed and oil routinely sold for $90 a barrel or more. But even with the surge, crude oil shipments remain less than 2 percent of all the carloads major U.S. railroads deliver. (AP Photo/The Star Tribune, Tom Wallace, File)
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