Tuesday's fiery crash is the latest in a string of accidents plauging the MTA rail line.
The agency has developed new systems for training workers, inspecting tracks and reducing train speeds.
William Rockefeller had an over-the-counter drug in his system that causes drowsiness, a report found.
The MTA planned to provide near full service on the Hudson Line, with scattered delays.
Gov. Andrew Cuomo said he believes excess speed caused seven cars of a Metro-North train to derail.
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