The North Pacific Coast Railroad (NPC) was a common carrier 3 ft (914 mm) narrow-gauge steam railroad begun in 1874 and sold in 1902 to new owners who renamed it the North Shore Railroad (California) (NSR) and which rebuilt the southern section into a standard-gauge electric railway.

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.