Defiance Bypass, Amtrak Cascades passenger train 501 derailed near Dupont, Washington, killing three passengers. The National Transportation Safety Board said in a news conference later that day that the event data recorder showed the speed to be , while the speed limit in the area was . Positive train control (PTC), a technology meant to help regulate train speed and prevent operator error, was reported to have been installed on the line, but preliminary reports state it was not active. WSDOT announced that it would not resume service until the full implementation of PTC. (Sounder service to Lakewood continued to operate.) Service was then scheduled to restart in early 2019. PTC was activated on the Bypass in March 2019 and the NTSB report was released in May that year; Cascades service resumed on the bypass on November 18, 2021, almost four years after the derailment. See also United States border preclearance Rail transportation in the United States Rail transport in Canada References Notes External links Amtrak Cascades Train Equipment (Washington State Department of Transportation) 1972 first draft of "Cascades" concept (Oregon Department of Transportation) Amtrak routes Named passenger trains of Canada International named passenger trains Passenger rail transport in British Columbia Passenger rail transportation in Oregon Passenger rail transportation in Washington (state) Tilting trains Railway services introduced in 1971 Talgo