A POLITICO analysis of federal data from more than 400 oil-train incidents since 1971 shows that a once-uncommon threat has escalated dramatically in the past five years:

This year has already shattered the record for property damage from U.S. oil-train accidents, with a toll exceeding $10 million through mid-May — nearly triple the damage for all of 2013. The number of incidents so far this year — 70 — is also on pace to set a record.
Almost every region of the U.S. has been touched by an oil-train incident. These episodes are spreading as more refineries take crude from production hot spots like North Dakota’s Bakken region and western Canada, while companies from California and Washington state to Missouri, Pennsylvania, Virginia and Florida build or expand terminals for moving oil from trains to barges, trucks or pipelines.