Positive reinforcement

摘要

There's only about two years left for the dozens of freight and commuter railroads impacted by the Rail Safety Act of 2008 to meet the federal deadline for implementing positive train control (PTC). Or, nearly four years remaining for those roads that meet certain conditions for a two-year extension, such as the installation of all PTC hardware by 2018's end. When completed, PTC systems will be operating on about 60,000 route miles in the United States. The systems will include devices installed on 25,000 passenger and freight locomotives, or 90 percent of all motive power.