instructinstruc instructor david wrangle. >> he is asked to do the job of two or three people. >> there is something no amount of training they can prepare an engineer for fatigue. >> we are dealing with humans and we have frail tis. >> back on the rails, klein says he has too much to worrybefore in just a few hours. every day, hundreds of engineers are travel thousands of miles of track and driving a train is a lot like playing chess. you have to think several move ahead only you have to do it at 70 miles per hour. chris frates, cnn, chicago. >> for cancer patients who have run out of options they know the end is inevitable, but there