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From page 1...
... RAIL TRANSIT TRACK INSPECTION PRACTICES In 2012, the number of transit rider trips in the United States reached a record 10.5 billion; according to APTA, almost half of those trips, 4.7 billion, were on transit-rail systems. Each one of those trips presents inherent risks because of the nature of the activity -- large vehicles in motion.
From page 2...
... 2 and gage; and a variety of propulsion methods (self-propelled, locomotive-hauled, diesel, electric, etc.)

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