The Martinez Subdivision is a

Union Pacific The Union Pacific Railroad is a Class I freight-hauling railroad that operates 8,300 locomotives over routes in 23 U.S. states west of Chicago and New Orleans. Union Pacific is the second largest railroad in the United States after BNSF, ...

railway line which runs from

Roseville, California Roseville is the most populous city in Placer County, California, located within the Sacramento metropolitan area. As of 2019, the United States Census Bureau, US Census Bureau estimated the city's population to be 141,500, making it the third-l ...

Oakland, California Oakland is a city in the East Bay region of the San Francisco Bay Area in the U.S. state of California. It is the county seat and most populous city in Alameda County, California, Alameda County, with a population of 440,646 in 2020. A major We ...

. It is informally referred to as the Cal-P line, after the original

California Pacific Railroad The California Pacific Railroad Company (abbreviated Cal. P. R. R. or Cal-P) was incorporated in 1865 at San Francisco, California as the ''California Pacific Rail Road Company''. It was renamed the ''California Pacific Railroad Extension Compan ...

, who constructed the line from

Sacramento Sacramento ( or ; ; ) is the capital city of the U.S. state of California and the seat of Sacramento County. Located at the confluence of the Sacramento and American Rivers in Northern California's Sacramento Valley, Sacramento's 2020 p ...

to Suisun and Fairfield. (As such, the nickname may only apply to that segment.) The line is entirely

double-tracked Double tracking or doubling is an audio recording technique in which a performer sings or plays along with their own prerecorded performance, usually to produce a stronger or bigger sound than can be obtained with a single voice or instrument. ...

including bridges, and features extensive sidings.

History

Originally built as a more direct route to the

San Francisco Bay San Francisco Bay (Chochenyo language, Chochenyo: 'ommu) is a large tidal estuary in the United States, U.S. state of California, and gives its name to the San Francisco Bay Area. It is dominated by the cities of San Francisco, California, San ...

to compete with the

Western Pacific Railroad The Western Pacific Railroad was a Class I railroad in the United States. It was formed in 1903 as an attempt to break the near-monopoly the Southern Pacific Railroad had on rail service into northern California. WP's Feather River Route dire ...

, the Cal-P segment opened months prior to the

First transcontinental railroad America's first transcontinental railroad (known originally as the "Pacific Railroad" and later as the "Overland Route (Union Pacific Railroad), Overland Route") was a continuous railroad line built between 1863 and 1869 that connected the exis ...

. California Pacific was taken over by the Central Pacific, which in late 1879 completed the line from Suisun-Fairfield to Oakland via the train ferry '' Solano'' from Benicia to Port Costa. The present double-track lift bridge across the

Carquinez Strait The Carquinez Strait (; Spanish: ''Estrecho de Carquinez'') is a narrow tidal strait located in the Bay Area of Northern California, United States. It is part of the tidal estuary of the Sacramento and the San Joaquin rivers as they drain int ...

replaced the train ferry in 1930. The California Pacific became part of the

Southern Pacific Railroad The Southern Pacific (or Espee from the railroad initials) was an American Railroad classes#Class I, Class I Rail transport, railroad network that existed from 1865 to 1996 and operated largely in the Western United States. The system was oper ...

(SP) which in the 1990s merged into the Union Pacific Railroad, the line's current owner. The subdivision forms part of the modern Overland Route. The

Capitol Corridor Joint Powers Authority The ''Capitol Corridor'' is a passenger train route in Northern California operated by Amtrak between San Jose, in the Bay Area, and Auburn, in the Sacramento Valley. The route is named after the two points most trains operate between, San ...

is planning to construct a third track between Sacramento and Roseville as part of a plan to expand

passenger rail A passenger train is a train used to transport people along a railroad line, as opposed to a freight train that carries goods. These trains may consist of unpowered passenger railroad cars (also known as coaches or carriages) push-pull train, ...

operations in the area.

Traffic

The line hosts several

Amtrak The National Railroad Passenger Corporation, Trade name, doing business as Amtrak (; ), is the national Passenger train, passenger railroad company of the United States. It operates intercity rail service in 46 of the 48 contiguous United Stat ...

passenger routes: the ''

Capitol Corridor The ''Capitol Corridor'' is a passenger train route in Northern California operated by Amtrak between San Jose, California, San Jose, in the Bay Area, and Auburn, California, Auburn, in the Sacramento Valley. The route is named after the two ...

'', ''

San Joaquins The ''San Joaquins'' is a state-supported passenger train service operated by Amtrak in California's San Joaquin Valley. As of 2025, the service operates seven daily round trips between its southern terminus at Bakersfield and Stockton. Of the ...

'', ''

Coast Starlight The ''Coast Starlight'' is a Amtrak Long Distance, long-distance passenger train operated by Amtrak on the West Coast of the United States between Seattle and Los Angeles via Portland, Oregon, Portland and the San Francisco Bay Area. The train, ...

'', and ''

California Zephyr The ''California Zephyr'' is a Amtrak Long Distance, long-distance passenger train operated by Amtrak between Chicago, Illinois, Chicago and the San Francisco Bay Area (at Emeryville station, Emeryville), via Omaha, Nebraska, Omaha, Denver, Sa ...

'' operate 36 trains daily over the

Benicia–Martinez Bridge The Benicia–Martinez Bridge refers to three parallel bridges which cross the Carquinez Strait just west of Suisun Bay in California. The spans link Benicia, California, Benicia on the north side with Martinez, California, Martinez on the south ...

. Union Pacific operates numerous freight trains over the route, and

BNSF BNSF Railway is the largest freight railroad in the United States. One of six North American Class I railroads, BNSF has 36,000 employees, of track in 28 states, and over 8,000 locomotives. It has three transcontinental routes that provide ...

has trackage rights in some segments. the line between Martinez and Sacramento saw 44 freight trains daily.

References

Rail lines in California Southern Pacific Railroad lines Union Pacific Railroad lines {{California-transport-stub