The abandoned railroad route between Union and West Napa, known as The Union Branch, of which 1.855 miles have been abandoned, was once operated in California by the Southern Pacific Railroad.
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I believe this section of track was later used by the California Northern to service the Napa Pipe plant in western Napa. Napa Pipe is now closed so it may, once again, be abandoned. The rest of the branch from Napa on north is used by the Napa Wine Train.
Do you have any pictures or information about The Union Branch? Please