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Cars. we've continued the testing of the signals and the signal circuitry. basically as the tracks are being rebuild, our signal specialists are going along to check the continuity of the signal circuitry. over the weekend, we plan to reassemble the train set as much as we can to put it back together, connect the brake lines, and conduct a brake test, and that will take several days. over the course of the last few days, some of you have asked what would we do if we could not talk to the engineer, and how would we resolve it and we -- one of the things we've called for in the wake of a failed ...

Full recovery. >> the ntsb says the initial data shows the train was racing into the curve at 106 miles per hour before the derailment. that is more than twice the 50 miles an hour posted limit for that curve. the engineer has been identified as 32-year-old brandon bostian. his attorney says bostian has absolutely no recollection of the crash. joining us to talk about challenges facing the investigation two people who know rely very well former ntsb safety investigator and cnn analyst mary schiavo. he told us they are going to do a brake test today, also said more data from the black box. the ...

Investigators believe, it was going more than twice as fast p 106 miles an hour. now, the engineer slammed on the brakes but it was too late. when the train derailed it had gotten down to 102 miles an hour. and now the question is why was it going so fast? i want to bring in ntsb investigator robert sumwalt. robert, good to see you. >> good morning, jose. >> i want to get to the issue of positive train control in a minute but first i need to ask you about the investigation. what's the main focus today? >> we're doing a lot today jose. we have investigators branched out in all different directi...

Were there any obvious mechanical signal problems anything on the track that stuck out to you -- >> are there any obvious mechanical or signal difficulties that we found? we have not -- again, we just basically got here. a lot of the emergency response has been going on till about 2:00. so we haven't been able to get that very thorough, up close and personal view of the track. we'll be doing a brake test of the train. there's a lot of work that needs to be done that will be done. and we will be letting you know periodically how we're going. again, look for another press briefing tomorrow. and ...

Restorative sleep. >> reporter: they say the eng e engineer is cooperating. >> he's a strong man and it takes a strong man to come down and be honest, and that's what billy is doing. >> reporter: on the question of the brakes, rockefeller claimed they didn't work at the time of the crash. >> we've determined that the metro north mechanical department performed a proper brake test prior to the accident train leaving the station, and there were no alom knees noted. based on this data, there is no indication the brake systems were not functioning properly. >> reporter: the facts, 82 miles per hou...