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Emergency personnel work at the scene of a deadly train derailment, Wednesday, May 13, 2015, in Philadelphia. The Amtrak train, headed to New York City, derailed and crashed in Philadelphia on Tuesday night, killing at least six people and injuring dozens of others. (AP Photo/Patrick Semansky)
Emergency personnel work at the scene of a deadly train derailment, Wednesday, May 13, 2015, in Philadelphia. The Amtrak train, headed to New York City, derailed and crashed in Philadelphia on Tuesday night, killing at least six people and injuring dozens of others. (AP Photo/Patrick Semansky)

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Other train crashes linked to speed

CNN's Suzanne Malveaux looks back on other train accidents where excessive speed may have played a role.

Other train crashes linked to speed

CNN's Suzanne Malveaux looks back on other train accidents where excessive speed may have played a role.