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The MG sign theta problem <br /> <br />The heaveir a train gets the more difficult it becomes to power it from the front end especially when going up and down hills. The weight of the train some times exceeds the tensile strength in the draw bars in the cars directly behind the power units. To much slack action and you pull the drawbar apart. Both the UP and BNSF use multiple DPU's in the mountains and in hilly teritory to avoid this problem. A lot of the time you will see a DPU in a train out on the flat lands that came from the mountains or hilly country simply because it is easier to run it though than to send out a crew to bring it back to a terminal
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