There are a bunch of SP prints in Dad’s stuff. Most have the Kodak date on the frame, but some don’t. No locations are noted and if you can help that would be terrific.
SP 1831 is an S4, I believe, based on the RR Archives although this unit isn’t there.
SP 5119 looks pretty rough here but it seems to be alive today : https://www.psrm.org/trains/diesel/sp-5119/
The mysterious Center Cab reminds me of the “Undec” that Walthers used to have listed.
Fred's Slides 