UPDATE: Railroad investigators find damage, washout areas at der - Tucson News Now

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UPDATE: Railroad investigators find damage, washout areas at derailment site

After clearing one set of tracks, inspectors approved it for reopening to traffic at about 3 a.m. on Wednesday, July 11. (Source: KOLD News 13) After clearing one set of tracks, inspectors approved it for reopening to traffic at about 3 a.m. on Wednesday, July 11. (Source: KOLD News 13)
UP crews working to clean up the derailed train. (Source: Tucson News Now) UP crews working to clean up the derailed train. (Source: Tucson News Now)
Debris from derailed train cars. (Source: Tucson News Now) Debris from derailed train cars. (Source: Tucson News Now)
Train derailed near I-10 and Twin Peaks. (Source: Tucson News Now) Train derailed near I-10 and Twin Peaks. (Source: Tucson News Now)
A train detrailed near Twin Peaks and Interstate 10 in Marana Tuesday afternoon. (Source: Tucson News Now) A train detrailed near Twin Peaks and Interstate 10 in Marana Tuesday afternoon. (Source: Tucson News Now)
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MARANA, AZ (Tucson News Now) -

Railroad investigators are working to determine what caused a train derailment in Marana on Tuesday, July 10.

The incident happened during a heavy thunderstorm that hit the area and caused flooding and other damage.

However, weather has not yet been confirmed as a factor in the derailment.

Crews have determined that there was no hazardous material on the train and Union Pacific has taken over the clean-up of wreckage and debris. 

According to a statement from the railroad early on Wednesday, July 11, crews worked through the night to inspect and secure the containers so they can be moved out of the scene. UP is using cranes to begin returning the derailed cars to an upright position on the tracks. 

ACTION DAY: Expect more monsoon activity on Wednesday | TRAFFIC ALERT: Derailment affecting traffic in Marana

Union Pacific inspectors found some damage and washout areas on the tracks involved in the derailment. There is no estimate yet on when repairs to this section of track will be complete so that traffic can resume.

There are two mainline sets of tracks in the area. After clearing one set of equipment and debris, inspectors approved it for reopening to traffic at about 3 a.m. on Wednesday. Trains are being allowed to use that set of tracks at a reduced speed while clean-up continues.

Investigators have not yet determined a cause for the derailment.

According to Northwest Fire District Capt. Brian Keeley, they received the call about the derailment between 3:15 p.m. and 3:30 p.m. 

UP officials say 27 cars, some carrying double containers, were derailed in the middle of the train. There was a great deal of water on the tracks at the time of the derailment, but investigators have not confirmed that the storm or runoff are the cause of the derailment.  

The crash happened as a strong thunderstorm hit the area on Tuesday afternoon, leading to flooding, road closures and several swift-water rescues.

If you have video or photos of the storms, please send them to pics@tucsonnewsnow.com

Debris at the scene of the derailment forced the closure of the frontage road along I-10, between Twin Peaks Road and Avra Valley Road. The road remains closed on Wednesday morning.

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