My 1st visit to Mendocino county was in 1966 and I could easily remember seeing the huge sign painted on a metal roof on top of a mill building along side of the North Western Pacific RR tracks in the town of Ukiah. Said, as I remember, "Home of the Presto Logs". It disappeared a few years later, though I believe the mill building still stands. Lots of 40' box cars and 53' flat cars abound. Thanks for the images!
Photo: Pres-To-Logs Boxcar
A 1930 photo of car 426 from the Potlatch Historical Society Collection:
Click on the photo to enlarge it.