Aaron Donovan, spokesman for the Metropolitan Transportation Authority, said the National Transportation Safety Board, which is investigating the crash, gave Metro-North the OK to remove the trains. Hundreds of feet of track need to be repaired, he said.
"We have a lot of work ahead of us, to restore signals and overhead wires," Donovan said.
Later today, the Connecticut Department of Transportation will announce jointly with Metro-North a plan for the rush-hour commute beginning tomorrow.
Service has been suspended between South Norwalk and New Haven, which includes stops at 12 stations.
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Donovan compared the loss of service to a "very significant storm."
Investigators said yesterday that the crash was not the result of foul play, but a fractured section of rail is being studied to determine if it is connected to the accident. National Transportation Safety Board member Earl Weener said the broken rail is of substantial interest to investigators and a portion of the track will be sent to a lab for analysis.
The crash damaged the tracks and threatened to snarl travel in the Northeast Corridor. The crash also caused Amtrak to suspend its passenger train service between New York and Boston.
NTSB investigators arrived Saturday and are expected to be on site for seven to 10 days. They will look at the brakes and performance of the trains, the condition of the tracks, crew performance and train signal information, among other things.