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L.A.'s positive train control system on track in wake of deadly 2008 crash

The Metro-North commuter train crash that killed four people and injured dozens more came just two years before the federal government's deadline for railroads to install automatic slowdown technology, or what's known as a positive train control system. Train operators in Los Angeles will begin testing the system next month. Bill Whitaker reports.

Source: L.A.'s positive train control system on track in wake of deadly 2008 crash