History and Development
The EMD SDP45 was a good passenger locomotive, but to the Santa Fe it did not look the part. EMD therefore designed a lightweight "cowl" body to cover the locomotive, though it did not, as in earlier cab units, provide any structural strength, which remained in the frame. The cowl provided sleeker looks, better aerodynamics at speed, and allowed the crew to enter the engine compartment en route for diagnostics and maintenance. Final drive gear ratio for passenger service was 59:18.
Read more about this topic: EMD FP45
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—Arthur Miller (b. 1915)