The Blair Brothers operations near Pollock Pines in the Sierra mountains east of Sacramento, pretty good film considering, and great information.
https://www.youtube.com/watch?v=CJWkybayobQ
Also, for you that may not have seen it or even know about it, here is a link to Jack Burgess’s docu, about the Yosemite lumber company’s logging inclines. Jack has been modeling the YV for years in HO scale and has written a great book about the operations as well as modeling a fantastic railroad.