quinby who is here with the latest for us. reporter: there will be a signal performance group, a track group, different expertise groups, which will also incorporate party members, people who are amtrak folks, union representatives. they will break up into groups and try to gather facts around their area of expertise. i know they are on the scene, but how quickly can they assemble this? we have learned there s a fuel leak that the hazmat team is cleaning up there. do they have to wait until this is cleaned up before they can get on the scene to assess the situation? it is just desil fuel, something like that, and it is very localized. they will get on the ground and hit the ground running right
leave the scene. ntsb will begin by mapping the scene usually with a 3-d scanner to produce a complete 3-d representation of the wreckage as it currently exists. then you have a number of functional teams from fra that will each begin to do their own work in unison. you have human factors group. you have a track group. you have a signal group. you also have an equipment group. they will all begin doing their own thing in unison to try and rule in or rule out certain potential aspects of causation. robert halstead thank you for your insight. it was so helpful. again, we re expecting this news conference with philadelphia s mayor to begin at any moment. i got to take a break. i ll be right back with more in the newsroom. mayo, corn dogs. you are so out of here! ahh. the complete balanced nutrition of great tasting ensure. with nine grams of protein. and 26 vitamins and minerals. and now with. .twice as much vitamin
secure the scene like a crime scene. effectively they ll get all the investigators will have to leave so the ems, fire personnel, all of those people will have to be off the scene and at that point the ntsb does a 3d mapping of the crime scene. it s not a crime scene but they re going to treat it sort of like that. they will complete that 3d representation of the wreckage exactly as it is right now. nothing gets moved until that gets done and then all these functional teams that come in and they work on different things simultaneously, so human factors, the track group, a signal group, and equipment group and they all work together but in concert but separately to do their own investigations. there are so many elements when you see, and we re taking a look, to remind our viewers, live pictures right now. we re going to be continuing to show those as ashleigh and i continue our conversation. those crews when you think of all of the elements at play and what ntsb has to map out, pull t
generally safe and they are getting safer. so explain how that s been accomplished when we see issues in our country of aging infrastructure not properly maintained and funded. the problem with railroad action is that they are a low probability high consequence type of event. they don t happen very often but when they do you can have significant property damage and human toll. now the tracks are required to be maintained in accordance with federal regulations for that particular speed of track. that s one of the things that the track group is going to be looking at is how well the track was maintained as it approached the point of derailment and whether or not that may have contributed. we ll wait to hear mayor nutter will be speaking any moment now. robert fascinating to hear your insights on this and what your gut is saying about images
pressure went to zero. as you may know, this train made nine stops prior to derailing. we need to understand how the brake system was working throughout that part of the trip. at this point, we are not aware of any problems or anomalies with the brakes. also today, we began interviewing the engineer. that interview will be continued over the next couple of days. we have interviews in process with the other three crew members. investigators from the track group have completed the assessment of the track, have conducted a detailed engineering survey of the site. earlier this afternoon, we released the track back to metro, metro north. investigators completed some of the signal testing. the rest of the signal testing will have to be accomplished tonight, late at night when the