The National Transportation Safety Board has asked the Federal Railroad Administration to issue an emergency order directing that trains or locomotives move at restricted speed when passing through territory on which the signal system has been suspended and a switch has been reported realigned for a main track.
The recommendation came following a Feb. 4 head-on collision between Amtrak’s Silver Star and a parked CSX auto rack train, resulting in two Amtrak crew members being killed.
Preliminary NTSB findings are that a misaligned switch routed the passenger train into the path of the freight train, near Cayce, South Carolina.
CSX personnel had turned off the signal system on the territory where the crash occurred in order to install updated traffic control system components for the implementation of positive train control.
That meant dispatchers were using track warrants to govern train movements through the work territory.
The accident was similar to one that occurred on March 14, 2016 in Granger, Wyoming.
The NTSB said safe movement of trains in the event of a signal system suspension hinges upon proper switch alignment.
In the case of the accidents that occurred in Wyoming and South Carolina, the switch alignment relied on error-free manual work, which was not safeguarded by either technology or supervision.
“The installation of the life-saving positive train control technology on the CSX tracks is not the cause of the Cayce, South Carolina, train collision,” said NTSB Chairman Robert Sumwalt in a statement. “While the collision remains under investigation, we know that signal suspensions are an unusual operating condition, used for signal maintenance, repair and installation that have the potential to increase the risk of train collisions. That risk was not mitigated in the Cayce collision. Our recommendation, if implemented, works to mitigate that increased risk.”