Home NTSB Looks At Disabled Signals, Locked Switch In Latest Deadly Amtrak Crash byRaza Butt -February 06, 2018 0 NTSB Looks At Disabled Signals, Locked Switch In Latest Deadly Amtrak Crash NPR Signal System Was Down for Safety Upgrades Before Fatal Amtrak Crash, Authorities Say New York TimesFull coverage Facebook Twitter