A few years ago I posted some comments about modeling SP’s diesel chronology, so I could accurately depict my modeling year of 1953 (see: http://modelingthesp.blogspot.com/2011/03/modeling-diesel-locomotive-chronology.html ). In that post, I alluded to an article I published some years past in the Southern Pacific Historical & Technical Society magazine, Trainline, in issue 29 (the magazine was not dated in those days, but I believe that issue came out in 1992), pages 18–23. The printed back issue is still available for sale (to buy it, visit: http://sphts.org/store/trainline-back-issues.html ), but I decided the article needed more visibility.
I have scanned all six pages, and made a PDF document, then put it onto Google Drive. If you would like to see it (or download, if you wish), here is the link:
This article gives delivery dates, to the month, of all diesels acquired by Southern Pacific’s Pacific Lines up to 1956, and also contains some representative photos. A bibliography documents the sources of all information. I hope this is helpful to modelers of the transition era on the SP.