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Maneuvering the curve where 188 derailed without problems. technology called automatic train control is now in place to slow northbound trains before the curve. >> if they were able to put atc in over the weekend, some are going to say, if it was this simple why not before? >> from the north to the south, you ear coming from a high rate of speed, 110 down to 50. you had to have it there. but from the south, the maximum speed was 80 and you could get around this corner at 80. >> reporter: at the crash site new steel fencing has been put up alongside the clocks. there might as well not even be f...

It would have been time to think. >> how about you? one reason to lead to another? >> it feels like a red herring, they are steering us away from it. if it did startle him in some way, perhaps there's a link. accidents offer a series of seemingly desperate events that lead to the accident. maybe this is part of it. >> we know the federal railroad administration has ordered amtrak to take additional steps. we have a full still of some of the things they are asking for. install automatic train control, there was that on the southbound route. analyze all curves for risk and increase maximum speed...

The ntsb says they found no evidence to back up an assistant conductor's claim she heard the engineer say train 188 had been hit. >> we've interviewed the septa engineer and he did not recall having any conversation between him and the amtrak engineer but nevertheless we do have this mark on the windshield the amtrak train and certainly want to trace that lead down. >> reporter: amtrak restored full service today along the busy northeast corridor. maneuvering the curve where 188 derailed without problems. technology called automatic train control is now in place to slow northbound trains befor...

Some people. >> positive train control includes an element which is the communication based signaling. the systems have been in place since the 1800s and the type of signals and what they mean. communication based signaling would have direct input into the automatic train control. they group those together as positive train control. that's what they are talking about when they talk about automated train control. >> so why hasn't that been there? is this money? is it congress dragging their feet? why isn't it on this corridor? we know how heavily trafficked it is. >> the amtrak is on schedule a...

Two deadly accidents. if it was this easy why wasn't this done year ago? >> amtrak had an explanation in the press release or explanation to the media. they said they put it on one way on the train as opposed to positive train control. they put it on one way. they thought operationally it made sense one way but not the other because of the speed which one would be traveling over that particular track. but automatic train control the thing they said have now put on the track, it's very old technology. it's been around perhaps 40 years, 30 years, it's been on the japanese bullet train since the ...