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The EMD SDP45 was a six-axle, C-C, diesel locomotive built by General Motors' Electro-Motive Division of La Grange, Illinois. It was fundamentally a passenger-hauling version of the SD45 on a stretched locomotive frame and with an extended, squared-off long hood at the rear, aft of the radiators, giving space for a steam generator for passenger train heating. This steam generator placement followed the pattern set by the SDP35 and SDP40.

A few SDP45s remain in service, rebuilt to SD40-2 standards.

Original Owners

The Southern Pacific Railroad ordered their ten on May 9, 1966 with the units being placed in service between May 24 and July 26, 1967, initially on the City of San Francisco between Oakland and Ogden, and eventually used system-wide. As built, each unit carried 2500 gallons of fuel and 3000 gallons of steam generator water in a partitioned underframe tank. The steam generator was a Vapor Model OK-4740. SP's units were built with Pyle National Gyralights on the leading end, came with Nathan P-3 horns, and cost $317,156 each (SP's straight SD45's from the same period cost $290,788 each). Ordered with 62:15 gearing with the overspeed set at 72 MPH, the gearing was changed to 60:17 (overspeed at 83 MPH) during 1968-1969. All except 3201 and 3207 would eventually be re-geared back to 62:15 once they entered commute service. After Amtrak took over long-distance routes in 1971, various units were leased to Amtrak for West Coast service (primarily on the Coast......
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