This from the AP:
Police have two men in custody following a wild pursuit of an all-terrain vehicle through the streets, parks and railroad tracks of Philadelphia.
Police are looking for a third suspect following a chase that lasted more than a half-hour Thursday night. Commuter train service had to be delayed as a police helicopter tracked the suspects following a report of a stolen vehicle.
News helicopter footage shows the yellow ATV weaving on and off the tracks and going over railroad bridges. Two men were eventually taken into custody, but a third was able to flee on foot. No injuries were reported.