A lot has changed there since the book was published in 2009. Below is a quick update on the locations listed, and when I have some more time (probably not till tomorrow) I'll try to post a newer more inclusive list per my notes.
Alpaugh -- West Isle Line, 5.5 mile line using ex SP GP9
WIL is still running with the GP9 and track mobile of some sort last I checked
Hanford -- Cargill, Mighy Cow GP9. Integrated Grain and Milling ex Santa Fe GP9. Penny Newman ex A&C GP20.
Mighty Cow is long gone. Integrated Grain and Milling has the GP9 (sometimes) and an SD20. There are two SD40T-2s at another grain/milling place in Kings Park. Penney Newman still has the GP20, but believe it is OOS. They also have an SD9 which they are currently using.
Tulare -- J.D. Heiskell hybrid loco. Land O'Lakes industrial loco.
The Heiskell loco was scrapped. It was not a hybrid, but some rebuilt thing. No idea about the Land O' Lakes loco.
Traver -- Foster Farms, two locos, one a CF7.
The CF7 is long gone. They have an SD38AC and some Genset.
Wasco -- Savage Coal, GP7. Long gone.
This operation has closed up as I recall.
Goshen -- Western Milling, GP9.
This is an ex-ATSF GP7. I dont believe they ever had a GP9. Believe this one is slated to be replaced with a Genset.
Pixley -- J.D. Heiskell, two GPs and one SD9.
These two GP9s and SD9 are shared with their operation at Tulare as I recall. Typically one GP is at Tulare.
Famoso -- Western Milling, one SD18.
SD18 is still there as of now, but slated to be replaced with a Genset as I recall
For fun, here is a flickr album with photos of 6 of the San Joaquin Valley Industrial Loco (and two others in SoCal: https://www.flickr.com/photos/142011876@N07/albums/72157674388404161
Hope this helps,