An SDP40 was an SD40 (not a -2) that was equipped with a steam generator for passenger service. There were several railroads that rostered them, but they weren't particularly common.
There's an SDP40 in Colton Yard service for UP.
Did CNW ever have any of these units? I have a BB Athearn SDP40 in CNW paint but havent been able to find evidence Chicago & Northwestern ever owned any of these locomotives. Im starting to think its this locomotive "foobie".
I'm not sure about SDP40 but I've seen a SDP45 in Ontario, CA not far from Colton. I have pictures to prove it too:
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the SP SD45P lost its 20 cylinder when it was rebuilt by MK in the early 90s