Only 35 EMD SDP35 locomotives were built, with 10 going to Union Pacific (UP 1400:2-1409:2). On occasion, these units handled special company passenger trains (which proved the SDP35 could not maintain demanding passenger train schedules). None of the SDP35s were ever used on revenue passenger assignments. These units often served as Chicago & North Western pilot-units out of Fremont, Nebraska, as these units were equipped with Union Switch & Signal Type "E" cab signals. During 1978-1979, these units received various air horn configurations as part of Union Pacific's audible alert testing.
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I saw some of these in Kansas City, MO in 1968, mixed with E-units, used on a local passenger train out of the Union Station, that picked up piggyback and freight cars on the Kansas side of the river, and proceed west as a "super" mixed train.
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