Lionel SP SD40

Definitely a custom-repaint job, and a pretty good one too.

Lionel did come out with an SD40 in the SP "bloody nose" paint scheme as part of the 6-11940 "Warhorse" set back in 1998, but unlike your model above it had unpainted black front and rear pilots, the handrails at the pilot steps were not painted white, the SP initials on the front nose was excessively oversized, and the cab number was 7333 with "Los Angeles" underneath instead of Eugene on yours.  That set included 4 grey "Pennsy style" quad hoppers derived from the old postwar version lettered in Cotton Belt, and a postwar-based SP baywindow caboose, also grey.  

Also, the prior owner (or whomever custom-painted it) also put some rust colored paint on the couplers, and it looks like the number board numbers are decals instead of black painted plastic inserts with clear raised numbers.  The other giveaway is that the Warhorse set also had a simulated "builder's plate" underneath the cab near the front steps that said "Lionel Pullmor Motor Division, Chesterfield Division, Chesterfield, Michigan" with the circle-L logo to the right of it instead of what would have been the EMD builder's plate.

That same Warhorse set also came with TMCC and RailSounds, so if yours has the old buzzy electronic "beep beep" horn it definitely was repainted from either a late MPC or early LTI era engine.

I agree with John, it is most likely an 80's or 90's repainted SD40 with the mechanical E-unit and dual Pullmor motors, and somewhat undesirable electronic horn. The chassis looks like it is during the LTI period since it has the 2 washers to secure the body to the chassis to prevent cracking.

Whoever custom painted it did a very good job, regardless, so you have a one of a kind item.

I would like to thank John and Mikado for their helpful insight. This answers a lot of questions. I am very happy with the loco and it runs very well. Thanks

SD40 John