One person was killed and more than 100 injured when a New Jersey Transit train crashed into the platform at Hoboken Terminal on Sept. 29. Investigators say they have found no defect in the brakes. Eduardo Munoz Alvarez/Getty Images hide caption

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Eduardo Munoz Alvarez/Getty Images

Three crew members were killed after a head-on freight train collision in Panhandle, Texas, on June 28 caused several boxcars to erupt in flames. Sean Steffen/Amarillo Globe-News via AP hide caption

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Sean Steffen/Amarillo Globe-News via AP

Investigators and first responders work near the wreckage of Amtrak Northeast Regional Train 188, which derailed May 13, 2015, in north Philadelphia. Eight people were killed and hundreds injured in the crash. Win McNamee/Getty Images hide caption

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Win McNamee/Getty Images

A photo of the truck that hit and shifted the train tracks, causing an Amtrak derailment in Kansas. National Transportation Safety Board via Twitter hide caption

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National Transportation Safety Board via Twitter

Smoke inhalation victims walk past a firefighter towards a medical aid bus Monday after passengers on the Washington, D.C., subway were injured when smoke filled the L'Enfant Plaza station during the afternoon rush hour. Paul J. Richards/AFP/Getty Images hide caption

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Paul J. Richards/AFP/Getty Images

National Transportation Safety Board Chairman Deborah Hersman briefing reporters about the July 2013 crash of Asiana Airlines Flight 214 in San Francisco. Justin Sullivan/Getty Images hide caption

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Justin Sullivan/Getty Images