The second railroad track damaged during Tuesday's train derailment reopened for travel in Marana Thursday, a Union Pacific official said.
The massive derailment involved 27 freight cars on Tuesday afternoon and closed the Interstate 10 frontage road from Twin Peaks to Avra Valley roads.
Union Pacific crews had been working to clear equipment and make repairs to the track for operations to resume since Tuesday evening. The first track was reopened on Wednesday for trains to travel at reduced speeds.
The tracks are a main freight route between California and Texas, according to Union Pacific.Β
Crews are still working to move contents onto rail cars or trucks to be transported out, which continues to shut down the I-10 frontage road. A time for reopening has not been determined.
On Tuesday, various items were displayed across the area, including UPS packages confirmed on board during the derailment.
No injuries were reported and no hazardous materials were involved, officials said.
Running water was on the tracks when firefighters arrived, said Brian Keeley, a Northwest Fire District spokesman, but the official cause of the derailment has not been released.
Photos: Union Pacific train derailed north of Tucson
Union Pacific train derailment in Marana
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Crews work on the cleanup of Tuesday's Union Pacific derailment north of Twin Peaks Rd on July 11, 2018
Union Pacific train derailment in Marana
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Piles of product lies alongside fallen train cars at the cleanup of Tuesday's Union Pacific derailment north of Twin Peaks Rd on July 11, 2018.
Union Pacific train derailment in Marana
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A crane lifts pre-fabricated rail sections onto the track bed during the cleanup of Tuesday's Union Pacific derailment north of Twin Peaks Rd on July 11, 2018.
Union Pacific train derailment in Marana
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Crews work on the cleanup of Tuesday's Union Pacific derailment north of Twin Peaks Rd on July 11, 2018.
Union Pacific train derailment in Marana
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A crane lifts pre-fabricated rail sections onto the track bed behind train car debris during the cleanup of Tuesday's Union Pacific derailment north of Twin Peaks Rd on July 11, 2018.
Union Pacific train derailment in Marana
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Packages litter the area around the fallen shipping cars during on the cleanup of Tuesday's Union Pacific derailment north of Twin Peaks Rd on July 11, 2018.
Union Pacific train derailment in Marana
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Workers sort through packages being pulled from overturned cars during the cleanup of Tuesday's Union Pacific derailment north of Twin Peaks Rd on July 11, 2018.
Train derailment
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Union Pacific train derailment on the east side of I-10 just north of Twin Peaks Road in Marana on July 10, 2018.
Train derailment
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Union Pacific train derailment on the east side of I-10 just north of Twin Peaks Road in Marana on July 10, 2018.
Train derailment
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An empty flatbed car on a bridge over a ditch filled with run-off following a train derailment just north of the Twin Peaks exit on I-10, Tuesday July 10, 2018.
Train derailment
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Several cars of an east bound train that derailed just north of the Twin Peaks exit on I-10, Tuesday July 10, 2018.
Train derailment
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Several cars askew but still attached to the front part of a train that lost several cars near the rear of the train to derail just north of the Twin Peaks exit on I-10, Tuesday July 10, 2018.
Train derailment
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Several cars and debris from an east bound train derailment just north of the Twin Peaks exit on I-10, Tuesday July 10, 2018.
Train derailment
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Several cars lie in a rain filled ditch, the rear portion of a train derailment just north of the Twin Peaks exit on I-10, Tuesday July 10, 2018.
Derailment
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Several partially clinging to the tracks and still attached to the lead train, part of a derailment just north of the Twin Peaks exit on I-10, Tuesday July 10, 2018, Tucson, Ariz.
