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instructor david wrangle. today, the passenger locomotive engineer is being asked to do so much ever than before. he s asked to do the job of two or three people. this is the cab. but there s something no amount of training can prepare an engineer for. fatigue. we re dealing with humans in the cabs of those locomotives, and we have frailties. back on the rails, making the return trip to chicago, klein says he s got too much to worry about to be distracted. again, there s always something going on. the alerter is going off. everything that s happening in front of you, it s for me, it s not real easy to lose concentration. and now he ll grab some rest before doing it all over again in just a few hours. every day, hundreds of engineers are traveling on thousands of miles of track. and driving a train is a lot like playing chess. you have to think several moves ahead. only, you have to do it at 70 miles per hour. chris freights, cnn, chicago. chris, thank you very much.