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Most engineers prefer a matched set because the loading is fairly equal. But on the otherhand it doesn't happen very often. When I used to assemble the outbound consists in Roseville for the UP, we would have to use what we had. The only trains that left on a regular basis with a matched sets were the ones that were running up and down the I-5 corridor from L.A. Ca. to Portland Or. Most of those units were the SP SD70's.
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