This Animated Map Shows How Moving Oil by Rail Exploded in the Past Five Years

America's oil boom has unearthed new supplies of crude so fast that the nation's system of pipelines hasn't been able to keep up. And so an industry is born: Crude by rail.

The animated map below shows the remarkable rise of trains that ship oil to refineries across the country. There was a 50-fold increase in crude by rail between January 2010 and January 2015, according to the Energy Information Administration, which started to comprehensively track the industry for the first time last week. In 2014, more than a million barrels of crude a day traveled by rail.