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My son's and I were watching trains on the U.P. main line out of Chicago. My oldest asked me a couple of question that perhaps one of you can answer. He noticed that some trains have only two engines and pull large amount of cars. These trains are made up of different type's of cars.While other trains that pull truck trailers and shipping containers have four engines on them but only 25 to 30 cars. Why don't they distribute the power more efficently? Also my youngest son wants to know why the mixed frieght trains have such niosey and dirty cars. Is it because they are older?
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