and i'm joined now by its chairman deborah hersman, welcome to the newshour. >> hello. >> woodruff: is there a consensus on why there have been as many accidents as there have been with explosions and the kind of mayhem we've seen? >> so i think the important thing to understand is we can prevent these accidents. so we've got to figure out how to prevent them and that means keeping the trains from derail in the first place or keeping them from having collisions so we've got to work on that. most of these events are caused by either human failure, human factors issues or track defects. so we've got to fix those two issues. and then the second piece of it is the mitigation. the tank cars and making those tank cars more crash-worthy if you do have an accident the final piece of it is the response because no communities is prepared for a worse case scenario if you lose the entire contents of one of these unit trains. >> woodruff: so in terms of making the cars, making this transport safer, what needs to be done that isn't being done right now? >> i think focusing on the prevention, keeping

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coverage from the national press club as outgoing national transportation safety board chair deborah hersman gives a farewell address and talks about some of the issues she focused on during her tenure. >>> all this week you can see booktv in prime time with a focus tonight on slavery and emancipation. at 8:30 p.m. eastern, author greg grandin in "the empire of necessity." he's followed at 9:35 by sylviane diouf about the history of those who escaped slavery and created self-sufficient communities in the south. and at 10:30, pulitzer prize-winning historian david brian davis with his third installment on the history of slavery in the west. booktv in prime time all this week here on c-span c-span2. >>> the d.c. circuit court of appeals ruled last week that the advocacy group common cause lacked standing to challenge the senate's filibuster rules. the court affirmed a lower court's decision but cited different reasons. the opinion called vice president biden an improper defendant even though he may preside over senate proceedings and that the injury was caused by an absent third party. common

. >> reporter: outgoing deborah hersman, flight 370, front acenter. >> certainly if we find those recordersing out what happened. >> reporter: the best lead rests on the ability of blue fine 21 and the location deciphered from satellite data where the plane went down and on four weak pings, just as the batteries in the black boxes were dying. >> my name is felicia. i'm a chief stewardess. >> reporter: this is as american airlines releases videos on youtube. the staffers forbidden to speak with media, it's an effort for the embattled airline company to get its side on the record. >> i can't understand what these families are experiencing now. >> reporter: families of those onboard received a briefing from officials. >> she believes that my daughter is still alive. now, u.s. navy spokesperson saying that there are now ongoing discussions between the u.s. and stakeholders here in australia talking about the way forward if it is not found in this current round of searching, then they will have to go back and figure out how they go forward in the next several months. that could mean bringing on