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| Two basic reasons, first is coupler strength. Putting all the HP on the head end puts enormous strain on the couplers. Most RR's have a tonnage limit determining where to put the Distributed power unit. Putting locomotives in the middle or hind end alleviates alot of the coupler strain problems.
Second is actually braking, the DPU will activate car brakes as well as the head end so you get better/quicker braking.
3rd is minor but in the winter, BNSF will run certain trains with a locomotive on the hind end to help with keeping the air line through the train charged up.
I play with trains for my day job. | |
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Railroad Question
