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NJ Transit posted a picture of the happy but dirty pup.
Officials say engineer Anthony Guzman saw the animal near Newark while he was working on the Morris & Essex line.
The 18-year veteran engineer stopped the eastbound train, climbed down and nabbed the pooch.
He brought it to the Secaucus station.
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Crews are working to reunite the dog with its owners.
This marked the second time in the last six months that train crews have spotted a dog in distress on a busy rail line.
NJ Transit Conductor Howard Kempton performed a similar rescue last October, when he spotted a dog on the tracks in East Orange.
That dog, named Shelby, was eventually reunited with its owners.
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