The Sacramento Northern Railway (reporting mark SN) was an 183-mile electric interurban railway that connected Chico in northern California with Oakland via the California capital, Sacramento. In its operation it ran directly on the streets of Oakland, Sacramento, Yuba City, Chico, and Woodland and ran passenger service until 1941 and freight service into the 1960s.  For a short time it ran directly into San Francisco using tracks on the San Francisco-Oakland Bay Bridge.  Some electric freight operation continued until the early 1960's.  For most of its operating life it was controlled by the Western Pacific Railroad, and in its last years was operated as an integral part of WP.

Today the history of the SN is well preserved by the Western Railway Museum at Rio Vista Junction.  The museum has an extensive collection of equipment from SN and other primarily electric railways, a large archive for pictures and records, and several miles of restored SN trackage.