Crews pulled an eighth body from the mangled wreckage of the Amtrack train that derailed and crashed Tuesday in Philadelphia, bringing the death toll to eight. A search dog helped locate what authorities say is the final victim of the crash.

Many of the more than 200 people who were injured remain hospitalized.

The six-car train was en route from  Washington, D.C. to New York, the Northeast Corridor, when it went off the track at approximately 9:30 p.m. and overturned. It was carrying was carrying 238 passengers and five crew members.

Cars "ripped apart"

"It is an absolute disastrous mess," Philadelphia Mayor Michael Nutter said. "Never seen anything like this in my life." He described cars that were "completely overturned, on their side, ripped apart."

The accident closed the nation's busiest rail corridor.

Investigators have determined that the train was traveling 106 miles per hour --more than twice the posted speed limit at the curve at which it derailed.

A lawyer for engineer Brandon Bostian says his client suffered a concussion and has very little memory of the moments before the accident. He denied that his client was under the influence of drugs or alcohol at the time of the crash, according to  news sources.

PTC not in place

Positive train control (PTC), a technology which can automatically slow or stop a speeding train, was not in place on the section of track where the train derailed and crashed.

Joseph H. Boardman, CEO of Amtrack, said that PTC would be added to the entire Northeast Corridor by the end of 2015.

Investigative eams from the National Transportation Safety Board and the Federal Railroad Administration are examining the wreckage and interviewing witnesses.

The derailment occurred on the same curve where one of America's worst train disasters occurred 71 years ago.

In September, 1943, another D.C. – to New York train derailed, killing 79 people and injuring 117 others. That accident was caused by mechanical failure.