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I have been under the impression that railroads restrict the number of units on the headend due to excessive horsepower snapping a coupler knucker if the brakes were not totally released through out the train, along with the excessive weight of mulitpe units in excess of six exceeding bridge live load restricions. <br />As far as the independent brakes goes, they apply braking forces on the head end only that in itself should not snap a train, wheres as the automatic brake applied at speed in full emergency has the capability of laying a train out all over the ground.
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