Railroads across the U.S. are making uneven progress in implementing Positive Train Control (PTC), the technology designed to automatically stop a train before collisions occur.
Despite having such poor vision that he drove with a restricted (auto) license, a train engineer was medically recertified by his employer, Union Pacific Railroad. Those vision problems contributed to fatal 2012 head-on collision between two freight trains in Oklahoma, according to the National Transportation Safety Board (NTSB).
