The Sierra Northern Railway (reporting mark SERA) is a common carrier railroad company operating in California.

[2] According to the AAR, the line operates 99 miles (159 km) of track in California.

[3] The company operates trains over two primary routes:[4] The Oakdale and West Sacramento (Lovdale)–Woodland lines have junctions with BNSF Railway and Union Pacific.

The Fort Bragg–Willits line, which has been closed since the collapse of a tunnel in 2012, has a junction with the defunct Northwestern Pacific Railroad in Willits.

[citation needed] This United States railway company-related article is a stub.