San Francisco and North Pacific Railroad (SF&NP) provided the first extensive standard gauge rail service to Sonoma County and became the southern end of the regional Northwestern Pacific Railroad. Although first conceived of by Asbury Harpending, who had even obtained many of the right of ways, the SF&NP was bought and subsequently constructed by Peter Donahue, who drove the first spike on August 30, 1869.
Sonoma County's first standard-gauge railroad, operated by the Sonoma County Railroad Company, was the Petaluma and Haystack Railroad connecting the city of Petaluma with ferry service to San Francisco from Haystack Landing on the Petaluma River in 1864. Petaluma and Haystack coaches were pulled by horses after the locomotive exploded on 27 August 1866.
SF&NP began construction from Petaluma northward in 1869, but inability to make satisfactory arrangements with the City of Petaluma caused the railroad to establish a new southern ferry terminus on the Petaluma River at Donahue Landing. Service was extended north to Santa Rosa in 1870, and Cloverdale in 1872. The Fulton and Guerneville Railroad was formed in 1874 to build a SF&NP branch from Fulton to Guerneville on the Russian River. The branch was completed in 1877. A Sonoma County atlas from 1877 claims that along the entire of the railroad line, there was no cut deeper than .
In 1879, the SF&NP was extended south through Petaluma to San Rafael in Marin County. The San Francisco and San Rafael Railroad was formed in 1882 to extend the SF&NP south another to a new ferry landing in Tiburon. SF&NP ferry terminal facilities were moved to Tiburon in 1884; and Donahue Landing faded into the rural countryside.
The Cloverdale and Ukiah Railroad was formed in 1886 to extend the SF&NP north to Ukiah in Mendocino County. Service began to Ukiah in 1889. The Santa Rosa, Sebastopol and Green Valley Railroad was formed in 1889 to build a SF&NP branch from Santa Rosa to Sebastopol. The branch was completed in 1890.
The California Northwestern Railway Company was formed in 1898 as part of Southern Pacific Railroad ambitions to reach the redwood lumber mills around Humboldt Bay. SF&NP struggled through the panic of 1893, and was leased by the California Northwestern in 1898. California Northwestern oversaw eastward connections to the Southern Pacific Railroad and northward extension to Willits before merger into the Northwestern Pacific Railroad in 1907.
Locomotives NumberNameBuilderTypeDateWorks numberNotes1Little JosieNorris Locomotive Works4-4-018621009ex-San Francisco and San Jose Railroad #2 San Jose became Northwestern Pacific Railroad #42J.G.DowneyBooth4-4-0187014became Northwestern Pacific Railroad #63W.J.RalstonBooth4-4-0187015became Northwestern Pacific Railroad #74GeyserBooth4-4-0187316scrapped 19045Santa RosaBooth4-4-0187317became Northwestern Pacific Railroad #56CloverdaleGrant Locomotive Works4-4-01878became Northwestern Pacific Railroad #117PetalumaGrant Locomotive Works4-4-01878became Northwestern Pacific Railroad #128San RafaelBaldwin Locomotive Works4-4-018815485became Northwestern Pacific Railroad #89MarinGrant Locomotive Works4-4-018831664became Northwestern Pacific Railroad #910HealdsburgGrant Locomotive Works4-4-018831665became Northwestern Pacific Railroad #1011UkiahBooth4-4-0187430scrapped 190712Peter DonahueRogers Locomotive Works4-4-018843305became Northwestern Pacific Railroad #1913Tom RogersRogers Locomotive Works4-4-018843306became Northwestern Pacific Railroad #2014TiburonGrant Locomotive Works4-4-01888became Northwestern Pacific Railroad #1415EurekaGrant Locomotive Works4-6-01888became Northwestern Pacific Railroad #10216VichyRogers Locomotive Works4-4-018894154became Northwestern Pacific Railroad #1817LyttonRogers Locomotive Works4-4-018894155became Northwestern Pacific Railroad #1718SkaggsRogers Locomotive Works4-6-018894212became Northwestern Pacific Railroad #10119Baldwin Locomotive Works4-6-0190017759became Northwestern Pacific Railroad #11020Richmond Locomotive Works4-6-019013304became Northwestern Pacific Railroad #10321American Locomotive Company4-6-0190225620became Northwestern Pacific Railroad #10522Baldwin Locomotive Works4-6-0190423933became Northwestern Pacific Railroad #10723Baldwin Locomotive Works4-6-0190423951became Northwestern Pacific Railroad #10824Baldwin Locomotive Works4-4-0190424035became Northwestern Pacific Railroad #2125American Locomotive Company4-6-0190225621became Northwestern Pacific Railroad #106
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