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Canadian National in the old days placed a limit on engines of 24 motorized axles or 4 three axles units 6 four axle units under power any more would be dead or idling and along for the ride. The reason given was the draw bars and couplers could and would kick out sideways under heavy braking and pulling load derailing the engines. My guess that different locomotives GM, EMD, would load up or brake differently causing excessive forces. <br />The main reason I can think of for there not being 10 or more engines coupled is the newer power does not require them to do a job.
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