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matt, the R is indeed a sign of a rebuild, it was part of UP's "life extension" program and was more than likely rebuilt at North Little Rock at the Jenks shop. as for the other unit, of the 45's except for IMRL,WC a few others, have had the original 20 cylinder engine removed and a 16 cyl 645 put in it's place, thus making it an SD-40-2. It just still has the outward look of a 45. a large number of these rebuilds are running around on the UP as they inhereted a whole bunch of these units that were rebuilt by Morrison-Knudson for the SP.
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