WASHINGTON (AP) - A young man talking on a cellphone meanders along the edge of a lonely train platform at night. Suddenly he stumbles, loses his balance and pitches over the side, landing head first on the tracks.

Fortunately there were no trains approaching the Philadelphia-area station at that moment, because it took the man several minutes to recover enough to climb out of danger. But the incident, captured last year by a security camera and provided to The Associated Press, underscores the risks of what government officials and safety experts say is a growing problem: distracted walking.

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I see a revenue stream!!!