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Philadelphia • The Amtrak train that crashed in Philadelphia, killing at least seven people, was hurtling at 106 mph before it ran off the rails along a sharp curve where the speed limit drops to just 50 mph, federal investigators said Wednesday.

The engineer applied the emergency brakes moments before the crash but slowed the train to only 102 mph by the time the locomotive's black box stopped recording data, said Robert Sumwalt, of the National Transportation Safety Board (NTSB). The speed limit just before the bend is 80 mph, he said.

The engineer, whose name was not released, refused to give a statement to law enforcement and left a police precinct with a lawyer, police said. Sumwalt said federal accident investigators want to talk to him but will give him a day or two to recover from the shock of the accident.

Mayor Michael Nutter said there was "no way in the world" the engineer should have been going that fast into the curve.

More than 200 people aboard the Washington-to-New York train were injured in the wreck, which happened in a decayed industrial neighborhood not far from the Delaware River just before 9:30 p.m. Tuesday. Passengers crawled out the windows of the torn and toppled rail cars in the darkness and emerged dazed and bloody, many of them with broken bones and burns. It was the nation's deadliest train accident in nearly seven years.

Meanwhile, a Republican-controlled House panel Wednesday approved deep spending cuts to Amtrak's budget just hours after the crash. The Appropriations Committee backed a $55 billion transportation and housing measure after rejecting Democratic attempts to boost spending on Amtrak by more than $1 billion, including $556 million targeted for the railroad's Northeast corridor, site of the derailment. The vote was 30-21 along party lines. The GOP bill would cut Amtrak's budget by $251 million, to $1.1 billion, for the upcoming fiscal year.

Amtrak suspended all service until further notice along the Philadelphia-to-New York stretch of the nation's busiest rail corridor as investigators examined the wreckage and the tracks and gathered evidence. The shutdown snarled the commute and forced thousands of people to find other ways to reach their destinations.

At least 10 people remained hospitalized in critical condition.

Nutter said some people were unaccounted for but cautioned that some passengers listed on the Amtrak manifest might not have boarded the train, while others might not have checked in with authorities. He said rescuers expanded the search area and were using dogs to look for victims in case someone was thrown from the wreckage.

Despite pressure from Congress and safety regulators, Amtrak had not installed along that section of track Positive Train Control, a technology that uses GPS, wireless radio and computers to prevent trains from exceeding the speed limit. Most of Amtrak's Northeast Corridor is equipped with Positive Train Control.

"Based on what we know right now, we feel that had such a system been installed in this section of track, this accident would not have occurred," Sumwalt said.

The notoriously tight curve is not far from the site of one of the deadliest train wrecks in U.S. history: the 1943 derailment of the Congressional Limited, bound from Washington to New York. Seventy-nine people were killed.