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UP has rebuilt many SD45, SD45-2, SD40 and SD39 units to SD40-2 standards including a 16-645E3 prime mover/generator set and electronics. These units include ex SP, D&RGW, N&W, CN&W and other units by way of leasing companies. The UP 4736 by my records Was SP 9137, built 01-70. As for the UP 3559, (built 03-79 as the UP 3559) I cannot find anything specific. Generaly the R indicates an upgrade type of rebuild, ie, SD40 to SD40R, in which updated components are incorporated to bring the unit to more current standards.
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