An interesting graphic.
WSJ link
"Today, about 939,000 barrels of oil a day are riding the rails, about 11% of the total pumped in the U.S., according data from the federal Surface Transportation Board, chugging across plains and over bridges, rumbling through cities and towns on their way to refineries on the coasts and along the Gulf of Mexico. If all the railcars loaded with crude on one day were hitched to a single locomotive, the resulting train would be about 17 miles long."
US daily consumption is about 8.5 million barrels
Cost to build a tankcar loading facility: about $50 million. Payback in only 5 years.
Full article behind WSJ paywall
WSJ: Railroads reshape crude market
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939,000 barrels gulf mexico surface transportation board 17 miles