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UP sometimes doubleheaded Big Boys over Sherman Hill. A great video about the Big Boys is produced by Pentrex. It shows vintage footage of all 25 Big Boys in steam, including some doubleheaded action. <br /> <br />In situations where manned helpers used to be used, UP and BNSF are using Distributed Power Units controlled from the lead cab. DPU is now the prevalent mode of "helper" power used today, making manned helper units unnecessary. A trio of SD90MACs on Sherman Hill likely may not need helper units because of their superior tractive effort. Or an DPU helper may be tacked onto the rear of the train. <br /> <br />Paul Schmidt
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