The Northwestern Pacific Railroad--the Redwood Empire Route--once stretched its shining track from Humboldt Bay to San Francisco Bay. Created by the amalgamation of 42 different companies, the North Coast railroad network ranged from the Sonoma Prismoidal, an early wooden monorail, to broad-gauge logging lines built to be hauled by horses. In between were the two-foot Sonoma Magnesite Railroad, the narrow-gauge North Pacific Coast, and standard-gauge...