Congress in October gave the nation’s railroads three more years, and possibly up to five, to install a mandated safety system that would automatically slow trains running at unsafe speeds, and which safety experts say could have prevented May’s fatal Amtrak derailment in Philadelphia.

As part of its ongoing investigation into the May 12, 2015, derailment of Amtrak Train 188 in Philadelphia, the National Transportation Safety Board said an analysis of the engineer’s cell phone records showed that no calls, texts, or data usage occurred during the time the engineer was operating the train.

Recent railroad accidents caused by employees doing routine repair work killed one person and endangered dozens of passengers and workers, according to the National Transportation Safety Board (NTSB), which has issued four recommendations intended to address the problem.

The National Transportation Safety Board (NTSB) will hold a Board meeting next week to determine the probable cause of train-truck collision in Nevada that killed six people and injured fifteen.