| http://www.w3.org/ns/prov#value | - After previous similar accidents it has renewed calls for railroads to install technology, including GPS units and computers, to keep trains out of the worst collisions.Safety board member Christopher Hart said in March, after a series of oil train accidents, that PTC, or positive train control, could have prevented 24 accidents over the past decade.Congress has mandated PTC be adopted by the end
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