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Southern Pacific (SP) "alligator" 3100 "even" was on the hump at Eugene, Oregon, on Friday, June 21, 1974. The gator, the hump yard and the SP are all gone now.
SP 3100 was an ALCo RSD15, DL600B, SP Class AS624-1. Reportedly it was built in 1959, construction number 83483, as SP 4816 class DF-502. It was leased in 1960 to T&NO as 250. These were the last units added to the T&NO roster before the 1961 merger. It became SP 5160 in the 1965 renumbering as class AF624-1. In 1972 it was reclassified to switcher Class AS624-1 and renumbered SP 3100. It was retired and sold in 1978.
According to OPRRMS years ago on Altamont Press, The black vertically mounted disk shaped object on the top of the cab is a, "Receiver for the in-cab hump signals. Used on hump engines at Eugene, LA and Houston until replaced by more a modern radio system. After the RSD15s were retired, they were installed on the three C628s that replaced them, but I don't recall them being on the MP15ACs."
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Kodachrome Slide 2-5.669 Scan 2010.11.13.1.14-ph
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