A new report has revealed the cause of a 2017 train derailment in the lower Hudson Valley.

On May 18, 2017, a Metro-North train derailed in Rye, New York, part of Westchester County. Five cars derailed at 4:56 p.m., according to The Hour. The train was heading westbound from Stamford headed for Grand Central Terminal.

The Hour reports that the engineer was operating the train at 55.9 mph, according to the National Transportation Safety Board. The engineer failed to heed a 10 mph temporary speed limit, that was imposed on the area after a track misalignment was found.

According to The Hour, the train had 185 passengers on board at the time of the derailment. 12 passengers suffered minor injuries. Four crew members also had injuries as well; one conductor and three assistant conductors.

New safety systems, PTC, were supposed to be in place nationwide on all railroads by December 31, 2018. Metro-North and the majority of the country's railroads missed that deadline. A new federal deadline of December 31, 2020, was announced, according to The Hour. PTC systems use a combination of computers, signals, antennas, and transponders to track trains and report their speed and position. PTC systems can halt a train going to fast for condition, operating on the wrong track, or approaching crossings that have not alerted motorists, according to The Hour.

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