In the late 1800s both the Southern Pacific Railroad (“SP”) and the Atchison, Topeka and Santa Fe Railway (“AT&SF”) had great interests in building lines north from San Francisco to Humboldt County to transport lumber south. The Southern Pacific Railroad controlled the southern end of the line from Willits south to Marin and Schellville, while the AT&SF controlled line south from Eureka through Humboldt County. Both railroads planned to build a line north, the AT&SF starting with a boat connection in present-day Larkspur, California, and the Southern Pacific, starting at its interchange in American Canyon, north through Napa, Sonoma, Mendocino and Humboldt counties to finally terminate in Eureka, California. As plans went forward it became clear that only one railroad would be profitable serving Mendocino and Humboldt Counties, so the Southern Pacific and Santa Fe entered into a joint agreement, and in 1906 merged 42 railroad companies between Marin and Humboldt Bay to create one railroad line stretching from Sausalito to Eureka. Completion of the project was disrupted by the 1906 San Francisco earthquake; plans and right-of-way documents were destroyed in the subsequent fire. After a time-expedient "punt" of the route through the unstable Eel River Canyon, construction was finally completed in October 1914 when a "golden spike" ceremony and celebration was held to mark the accomplishment. There were also dozens of miles of narrow-gauge trackage in Marin and Sonoma Counties.