AP
National Transportation and Safety Board chairman Robert Sumwalt gestures during a press briefing in Columbia, S.C., Monday, Feb. 5, 2018, as he speaks on the investigation of Sunday's train collision in Cayce, S.C. Railway signals were out while crews installed a safety system that could have prevented the exact type of crash that killed two people in South Carolina when an Amtrak train was diverted to a side track and slammed head-on into an empty freight train, authorities said Monday. (Tracy Glantz/The State via AP)
- Tracy Glantz
The site of Sunday's early morning train crash between an Amtrak train, bottom, and a CSX freight train, top left, in Cayce, S.C. Federal investigators are planning to give an update on their probe into a deadly crash between a freight train and a passenger train in South Carolina. The National Transportation Safety Board says on Twitter that the agency will hold a meeting briefing at 4 p.m. Monday, Feb. 5, 2018, near the Columbia Metropolitan Airport.( AP Photo/Jeff Blake)
- Jeff Blake
The site of Sunday's early morning train crash between an Amtrak train, bottom, and a CSX freight train, top left, in Cayce, S.C. Federal investigators are planning to give an update on their probe into a deadly crash between a freight train and a passenger train in South Carolina. The National Transportation Safety Board says on Twitter that the agency will hold a meeting briefing at 4 p.m. Monday, Feb. 5, 2018, near the Columbia Metropolitan Airport.( AP Photo/Jeff Blake)
- Jeff Blake
The site of Sunday's early morning train crash between an Amtrak train, bottom, and a CSX freight train, top left, in Cayce, S.C. Federal investigators are planning to give an update on their probe into a deadly crash between a freight train and a passenger train in South Carolina. The National Transportation Safety Board says on Twitter that the agency will hold a meeting briefing at 4 p.m. Monday, Feb. 5, 2018, near the Columbia Metropolitan Airport.( AP Photo/Jeff Blake)
- Jeff Blake
The site of Sunday's early morning train crash between an Amtrak train, bottom, and a CSX freight train, top left, in Cayce, S.C. Federal investigators are planning to give an update on their probe into a deadly crash between a freight train and a passenger train in South Carolina. The National Transportation Safety Board says on Twitter that the agency will hold a meeting briefing at 4 p.m. Monday, Feb. 5, 2018, near the Columbia Metropolitan Airport.( AP Photo/Jeff Blake)
- Jeff Blake