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UP DD35 DD40X
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In addition to permanently coupled sets, E units were double-engine locos and UP had a lot of them, so apparently UP wasn't too worried about inflexibility when they ordered the DD units. The later ones were ordered with high speed gearing for use on livestock specials and other fast freight trains. A book I have on the LA&SL has quite a few pictures of these trains and some of them ran across Nevada with 8 or more early GPs and SDs. During the steam era they ran with double headeded Challengers and one picture shows 2 complete A-B-B-A sets of FAs, or about 12,000 hp.
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