The southern portion of a 100-year-old bridge over the Salt River in Tempe, Ariz., collapsed after a July 29 train derailment that caused chemicals to leak from several railcars at the scene.
According to Union Pacific officials, at around 6:15 a.m. PDT, the Union Pacific freight train derailed, and eight to 10 rail cars caught fire. There were no injuries among the train crew members, although one person was treated for smoke inhalation.