Hi Cactus Flower,
Rachel Maddow showed an explosion on the rails & it is terrifying.

A fireball erupted from an exploding train car after a crash outside Casselton, N.D., in December. Oil from the state's Bakken Shale isn't stabilized to make it less volatile. Zuma Press
However, if this crude gets into the water system that will be even more destructive, long term.
a snippet
Rail vs. pipeline
Federal officials and industry groups point out that the overwhelming majority — more than 99.9 percent, they say — of crude-by-rail shipments reach their destination safely.
http://www.midwestenergynews.com/2014/01/07/in-north-dakota-oil-train-explosion-a-wake-up-call/