to survive. they don't have the answers right now, but three did not. we will wait to learn about the five others. >> so tragic. doing their jobs trying to help people and losing their lives in the process. a tragic twist. thank you for that. we will bring you more information as we get it. there's new information on the crash of amtrak 188. the engineer driving the train has agreed to be interviewed by the national transportation safety board. 32-year-old brandon bostian was at the controls when the train derailed outside philadelphia. ntsb officials hope bostian can answer the remaining questions. here are the questions. why did that train accelerate from 70 miles per hour to over 100 in just the moments before the crash? we are learning this morning that amtrak was just months away from installing a safety system that would have prevented the deadly accident. cnn's brian todd is in