Central Corridor (Union Pacific Railroad)
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The Central Corridor is a rail line operated by the
Union Pacific Railroad The Union Pacific Railroad is a Railroad classes, 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 Stat ...
from near
Winnemucca, Nevada Winnemucca () is the only incorporated city in Humboldt County, Nevada, United States, of which it is also the county seat. As of the 2020 United States census, 2020 census, the city had a total population of 8,431, up 14.0 percent from the 2010 ...
to
Denver, Colorado Denver ( ) is a List of municipalities in Colorado#Consolidated city and county, consolidated city and county, the List of capitals in the United States, capital and List of municipalities in Colorado, most populous city of the U.S. state of ...
in the
western United States The Western United States (also called the American West, the Western States, the Far West, the Western territories, and the West) is List of regions of the United States, census regions United States Census Bureau. As American settlement i ...
. The line was created after the merger with the
Southern Pacific Transportation Company The Southern Pacific (or Espee from the railroad initials) was an American Class I railroad network that existed from 1865 to 1996 and operated largely in the Western United States. The system was operated by various companies under the names ...
by combining portions of lines built by former competitors. No portion of the line was originally built by the Union Pacific; in fact, some portions were built specifically to compete with the Union Pacific's Overland Route. The line is known for significant feats of engineering while crossing the Wasatch Mountains of Utah and the
Rocky Mountains The Rocky Mountains, also known as the Rockies, are a major mountain range and the largest mountain system in North America. The Rocky Mountains stretch in great-circle distance, straight-line distance from the northernmost part of Western Can ...
of Colorado. The line features numerous tunnels; the longest and highest of these is the Moffat Tunnel.


Usage

The line is primarily used for freight by the Union Pacific. The
BNSF Railway 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 railroad, transcontine ...
has
trackage rights Railway companies can interact with and control others in many ways. These relationships can be complicated by bankruptcies. Operating Often, when a railroad first opens, it is only a short spur of a main line. The owner of the spur line may c ...
on the entire line; the Utah Railway has trackage rights from
Salt Lake City Salt Lake City, often shortened to Salt Lake or SLC, is the capital and most populous city of the U.S. state of Utah. It is the county seat of Salt Lake County, the most populous county in the state. The city is the core of the Salt Lake Ci ...
to
Grand Junction, Colorado Grand Junction is a List of municipalities in Colorado#Home rule municipality, home rule municipality that is the county seat and largest city of Mesa County, Colorado, United States. Grand Junction's population was 65,560 at the 2020 United St ...
. However, parts of the line host significant passenger rail traffic.
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 ...
's ''
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 ...
'' uses the entire length of the Central Corridor, as part of its
San Francisco San Francisco, officially the City and County of San Francisco, is a commercial, Financial District, San Francisco, financial, and Culture of San Francisco, cultural center of Northern California. With a population of 827,526 residents as of ...
to
Chicago Chicago is the List of municipalities in Illinois, most populous city in the U.S. state of Illinois and in the Midwestern United States. With a population of 2,746,388, as of the 2020 United States census, 2020 census, it is the List of Unite ...
route. In addition, the portion from
Salt Lake City Salt Lake City, often shortened to Salt Lake or SLC, is the capital and most populous city of the U.S. state of Utah. It is the county seat of Salt Lake County, the most populous county in the state. The city is the core of the Salt Lake Ci ...
to
Provo, Utah Provo ( ) is a city in and the county seat of Utah County, Utah, United States. It is south of Salt Lake City along the Wasatch Front, and lies between the cities of Orem, Utah, Orem to the north and Springville, Utah, Springville to the south ...
hosts a separate, dedicated track built by the
Utah Transit Authority The Utah Transit Authority (UTA) is a special service district responsible for providing public transportation throughout the Wasatch Front of Utah, in the United States, which includes the metropolitan areas of Ogden, Utah, Ogden, Park City, U ...
for the southern half of the ''
FrontRunner ''FrontRunner'' is a Commuter rail in North America, commuter railway operated by the Utah Transit Authority (UTA) that runs along the Wasatch Front in north-central Utah with service from Ogden Central station in central Weber County, Utah, ...
''
commuter rail Commuter rail or suburban rail is a Passenger train, passenger rail service that primarily operates within a metropolitan area, connecting Commuting, commuters to a Central business district, central city from adjacent suburbs or commuter town ...
service. A portion of the route immediately northwest of Denver also has dedicated electrified tracks for use by RTD commuter rail.


Route description


Nevada

Proceeding east out of Winnemucca, the route follows the
Humboldt River The Humboldt River is the longest river in the northern and central part of Nevada. It extends in a general east-to-west direction from its headwaters in northern Nevada's Jarbidge Mountains, Jarbidge, Independence Mountains, Independence, and ...
, in a directional running setup with the Overland Route until
Wells, Nevada Wells is a small city in Elko County, in northeast Nevada in the western United States. The population was 1,292 at the 2010 census. Wells is located at the junction of Interstate 80 and U.S. Route 93, approximately east of Elko and is par ...
. From Wells to Salt Lake, the route, known as the Shafter Subdivision, loosely follows the historical route of the Hastings Cutoff, tunneling underneath the Pequop Mountains and crossing the Toano Range via Silver Zone Pass. The eastern approach to Silver Zone Pass features a near 360 degree horseshoe curve known as the Arnold loop. After crossing these mountain ranges the route proceeds southwest towards the
Great Salt Lake Desert The Great Salt Lake Desert (colloquially referred to as the West Desert) is a large dry lake in northern Utah, United States, between the Great Salt Lake The Great Salt Lake is the largest saltwater lake in the Western Hemisphere and the ei ...
. In Nevada,
Interstate 80 Interstate 80 (I-80) is an east–west transcontinental freeway that crosses the United States from San Francisco, California, to Teaneck, New Jersey, in the New York metropolitan area. The highway was designated in 1956 as one of the ori ...
follows the Central Corridor, though the two routes are several miles apart in places.


Utah

The route enters Utah at Wendover and crosses the Great Salt Lake Desert and the Bonneville Salt Flats, parallel to
Interstate 80 Interstate 80 (I-80) is an east–west transcontinental freeway that crosses the United States from San Francisco, California, to Teaneck, New Jersey, in the New York metropolitan area. The highway was designated in 1956 as one of the ori ...
and the Wendover Cut-off, en route to the southern shore of the
Great Salt Lake The Great Salt Lake is the largest saltwater lake in the Western Hemisphere and the eighth-largest terminal lake in the world. It lies in the northern part of the U.S. state of Utah and has a substantial impact upon the local climate, partic ...
and
Salt Lake City Salt Lake City, often shortened to Salt Lake or SLC, is the capital and most populous city of the U.S. state of Utah. It is the county seat of Salt Lake County, the most populous county in the state. The city is the core of the Salt Lake Ci ...
. Upon reaching Salt Lake City, the line turns south and follows the
Jordan River The Jordan River or River Jordan (, ''Nahr al-ʾUrdunn''; , ''Nəhar hayYardēn''), also known as ''Nahr Al-Sharieat'' (), is a endorheic river in the Levant that flows roughly north to south through the Sea of Galilee and drains to the Dead ...
through Point of the Mountain towards Spanish Fork. After Spanish Fork, the rail line joins the U.S. Route 6 corridor, and the two follow each other towards Denver. Both routes follow the Spanish Fork (river) up a grade in the
Wasatch Plateau The Wasatch Plateau is a plateau located southeast of the southernmost part of the Wasatch Range in central Utah. It is a part of the Colorado Plateau. Geography The plateau has an elevation of and includes an area of . Its highest point is So ...
, cresting at Soldier Summit. The western approach to Soldier Summit is known for the Gilluly loops, a series of horseshoe curves that allow the railroad to crest the mountains while maintaining grade that never exceeds 2.4%, unlike the highway, which was built using an older railroad grade, that features grades in excess of 5%. The railroad descends from Soldier Summit following the Price River until reaching the town of Helper, so named because in the era of
steam locomotive A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, Fuel oil, oil or, rarely, Wood fuel, wood) to heat ...
s, the railroad added or removed
helper engine A bank engine (United Kingdom/Australia) (colloquially a banker), banking engine, helper engine or pusher engine (North America) is a railway locomotive that temporarily assists a train that requires additional Engine power, power or tractive ef ...
s here for trains crossing Soldier Summit. Upon exiting the Wasatch Mountains, the train follows the southern rim of the
Book Cliffs The Book Cliffs are a series of desert mountains and cliffs in western Colorado and eastern Utah in the Western United States. They are so named because the cliffs of Cretaceous sandstone capping many of the south-facing buttes appear simila ...
, in route serving the towns of Woodside, Green River (where the rail line crosses the Green River), Thompson Springs and
Cisco Cisco Systems, Inc. (using the trademark Cisco) is an American multinational digital communications technology conglomerate corporation headquartered in San Jose, California. Cisco develops, manufactures, and sells networking hardware, s ...
. Near Cisco is where the rail line for the first time meets the
Colorado River The Colorado River () is one of the principal rivers (along with the Rio Grande) in the Southwestern United States and in northern Mexico. The river, the List of longest rivers of the United States (by main stem), 5th longest in the United St ...
, which provides the path up the
Rocky Mountains The Rocky Mountains, also known as the Rockies, are a major mountain range and the largest mountain system in North America. The Rocky Mountains stretch in great-circle distance, straight-line distance from the northernmost part of Western Can ...
in Colorado. The rail line follows and crosses the river numerous times in Colorado while ascending the Rockies. Ruby Canyon is where the rail line reaches the state line.


Colorado

The railroad enters Colorado along the north bank of the Colorado River, following the river to the Grand Valley, passing through the heart of Grand Junction and surrounding cities along the way. The tracks continue to follow the river out of the valley, routed along Debeque Canyon, Glenwood Canyon and Gore Canyon of the Colorado River towards
Granby, Colorado The Town of Granby is the List of municipalities in Colorado#Statutory town, Statutory Town that is the List of municipalities in Colorado, most populous municipality in Grand County, Colorado, Grand County, Colorado, United States. The town pop ...
near the headwaters of the river. The railroad departs the main stem of the Colorado river to follow the
Fraser River The Fraser River () is the longest river within British Columbia, Canada, rising at Fraser Pass near Blackrock Mountain (Canada), Blackrock Mountain in the Rocky Mountains and flowing for , into the Strait of Georgia just south of the City of V ...
, one of its tributaries until reaching the crest of the Rocky Mountains which is surmounted via the Moffat Tunnel. With the decommissioning of the route over Tennessee Pass, the Moffat Tunnel is the highest point on the Union Pacific system. The eastern descent from the Moffat Tunnel towards the
Front Range The Front Range is a mountain range of the Southern Rocky Mountains of North America located in the central portion of the U.S. State of Colorado, and southeastern portion of the U.S. State of Wyoming. It is the first mountain range encounter ...
, where Denver resides, features 33 tunnels, leading to this portion commonly called the Tunnel District. This portion of the tracks loosely follows Colorado State Highway 72, though at points the two corridors are in different canyons and several miles apart. Even past where the tracks exit the Rocky Mountains, the grade features horseshoe curves in the final descent. The tracks approach the Denver metropolitan area from the northwest, before merging with other rail lines just north of downtown Denver.


Subdivisions

The Union Pacific has divided the Central Corridor into these subdivisions for operational purposes: *Moffat Tunnel Subdivision from
Denver Denver ( ) is a List of municipalities in Colorado#Consolidated city and county, consolidated city and county, the List of capitals in the United States, capital and List of municipalities in Colorado, most populous city of the U.S. state of ...
to
Bond, Colorado Bond is an unincorporated community and U.S. Post Office located along the Colorado River in Eagle County, Colorado, United States. The Bond post office has the ZIP Code 80423. Although Bond has never had a sizable population, the town has sig ...
*Glenwood Springs Subdivision from Bond to Grand Junction * Green River Subdivision from Grand Junction to Helper, Utah * Provo Subdivision from Helper to
Salt Lake City Salt Lake City, often shortened to Salt Lake or SLC, is the capital and most populous city of the U.S. state of Utah. It is the county seat of Salt Lake County, the most populous county in the state. The city is the core of the Salt Lake Ci ...
* Lynndyl Subdivision Salt Lake City to Smelter (adjacent to the Kennecott Smokestack) * Shafter Subdivision from Smelter to
Elko, Nevada Elko is a city in and the county seat of Elko County, Nevada, United States. As of the official 2020 U.S. Census, the city has a population of 20,564. Elko serves as the center of the Ruby Valley, a region with a population of over 55,000. Elko ...
* Elko Subdivision from Elko to Winnemucca


History

All of the Central Corridor was built by former competitors to the Union Pacific. The portion from Winnemucca to
Salt Lake City, Utah Salt Lake City, often shortened to Salt Lake or SLC, is the List of capitals in the United States, capital and List of cities and towns in Utah, most populous city of the U.S. state of Utah. It is the county seat of Salt Lake County, Utah, Salt ...
was originally part of the Feather River Route, built by 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 ...
, acquired by the Union Pacific in 1983. The portion from Salt Lake City to
Grand Junction, Colorado Grand Junction is a List of municipalities in Colorado#Home rule municipality, home rule municipality that is the county seat and largest city of Mesa County, Colorado, United States. Grand Junction's population was 65,560 at the 2020 United St ...
is the former Utah Division of the Denver and Rio Grande Western (D&RGW). From Grand Junction to Dotsero, Colorado was part of the Tennessee Pass Line, also built by the D&RGW. From Dotsero to
Bond, Colorado Bond is an unincorporated community and U.S. Post Office located along the Colorado River in Eagle County, Colorado, United States. The Bond post office has the ZIP Code 80423. Although Bond has never had a sizable population, the town has sig ...
is the former Dotsero Cutoff, built by the D&RGW as a connection between their main line with the main of the unfinished Denver and Salt Lake Railroad, which provided the connection from Bond to
Denver, Colorado Denver ( ) is a List of municipalities in Colorado#Consolidated city and county, consolidated city and county, the List of capitals in the United States, capital and List of municipalities in Colorado, most populous city of the U.S. state of ...
. The portion east of Salt Lake City came under the Union Pacific's control from the 1996 acquisition of the
Southern Pacific Transportation Company The Southern Pacific (or Espee from the railroad initials) was an American Class I railroad network that existed from 1865 to 1996 and operated largely in the Western United States. The system was operated by various companies under the names ...
. The Western Pacific and D&RGW portions of the line were part of the Gould transcontinental system. During 2022 and 2023 the Central Corridor was at the center of controversy, due to the fact that with the Uinta Basin Railroad construction project in
Utah Utah is a landlocked state in the Mountain states, Mountain West subregion of the Western United States. It is one of the Four Corners states, sharing a border with Arizona, Colorado, and New Mexico. It also borders Wyoming to the northea ...
, an increase in the number of trains loaded with waxy-crude Oil that would run daily through the Corridor was projected. The project also included an eventual reactivation of the line from Dotsero to
Pueblo Pueblo refers to the settlements of the Pueblo peoples, Native American tribes in the Southwestern United States, currently in New Mexico, Arizona, and Texas. The permanent communities, including some of the oldest continually occupied settlement ...
through the Tennessee Pass (out of service since 1997) to decompress the Central Corridor should it operate at the limit of its maximum daily train capacity. Both Eagle County and environmental groups lobbied hard to put the project on hold for the time being, citing the potential risks of increased oil train daily traffic both in the Central Corridor and eventually through Tennessee Pass. One of the major concerns that both Eagle County and environmental groups indicated is that if a major derailment were to occur on the Central Corridor or Tennessee Pass route with the resulting Oil spill, the environmental consequences to the
Colorado River The Colorado River () is one of the principal rivers (along with the Rio Grande) in the Southwestern United States and in northern Mexico. The river, the List of longest rivers of the United States (by main stem), 5th longest in the United St ...
(which runs adjacent to the Central Corridor rail tracks), or the
Arkansas River The Arkansas River is a major tributary of the Mississippi River. It generally flows to the east and southeast as it traverses the U.S. states of Colorado, Kansas, Oklahoma, and Arkansas. The river's source basin lies in Colorado, specifically ...
, which runs adjacent to the Tennessee Pass tracks, would be catastrophic. Eagle County's opposition to the Uintah Basin project led to the
Supreme Court In most legal jurisdictions, a supreme court, also known as a court of last resort, apex court, high (or final) court of appeal, and court of final appeal, is the highest court within the hierarchy of courts. Broadly speaking, the decisions of ...
ruling '' Seven County Infrastructure Coalition v. Eagle County'' focused on an appeal court's interpretation of the
National Environmental Policy Act The National Environmental Policy Act (NEPA) is a United States environmental law designed to promote the enhancement of the environment. It created new laws requiring U.S. federal government agencies to evaluate the environmental impacts of ...
which had paused the Uinta Basin Rail project. In an 8-0 ruling, the court ruled against Eagle County, citing that potential environmental impacts there from the Utah rail project on rail traffic outside of the Uinta Basin line itself, is outside the scope of an
environmental impact statement An environmental impact statement (EIS), under United States environmental law, is a document required by the 1969 National Environmental Policy Act (NEPA) for certain actions "significantly affecting the quality of the human environment". An E ...
as outlined according to NEPA.


See also

* Sunset Route


References

{{reflist Union Pacific Railroad lines Rail infrastructure in Colorado Rail infrastructure in Nevada Rail infrastructure in Utah