AI Summary

A two-year-old pitbull, identified as Roo, was rescued after spending two days trapped in a dim San Francisco railway tunnel. Roo had wandered away from home and was spotted by Caltrain operators on the first day of his ordeal, but at the time, he appeared lifeless. The dog's rescue came after a second sighting, during which he was found curled up next to a rail track, indicating he had survived the initial period of observation.

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