The Northwestern Pacific Railroad is a 271-mile (436 km) mainline railroad from the ferry connections in Sausalito, California north to Eureka with a connection to the national railroad system at Schellville. The railroad has gone through a history of different ownership and operators but has maintained a generic name of reference as The Northwestern Pacific Railroad, despite no longer being officially named that. Currently, only a 62-mile (100 km) stretch of mainline from Larkspur to the Sonoma County Airport in Windsor and east to Schellville on the “south end” is operated by Sonoma–Marin Area Rail Transit (SMART), which operates both commuter and freight trains with plans for future extension north to Cloverdale. The “north end” from Willits to Eureka is currently out of service, but saved by 2018 legislation to be converted into the Great Redwood Trail.

Windsor is an incorporated town in Sonoma County, California, United States. The town is 9 miles north of Santa Rosa and 63 miles north of San Francisco. The population was 26,344 as of the 2020 census.