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While DPUs have eleminated most of the manned helpers they still exist. Montana Rail Link uses manned mid-train helpers westbound out of Helena, Montana over Mullan Pass. CSX uses manned mid-train helpers on the Sand Patch grade, when coupler forces require it. Otherwise they used manned pushers. It is an economical question when to use run-through DPUs or to cut in manned units when the additional power is necessary only over a short distance. NS uses manned pushers westbound out of Altoona, PA. There might be more helper districts. Regards, Volker
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