Question: Which train company has a train that for most of its history has run between New Orleans and Los Angeles, over the nation's second transcontinental route?

Context paragraphs:
Acadian (train): The Acadian was the name of a passenger train of the Southern Pacific which ran daily between New Orleans, Louisiana, and Houston, Texas.  The "Acadian" was one of several passenger trains, including the "Sunset Limited" and "Argonaut", which operated over the "Sunset Route".  The 1956 iteration of the "Acadian" (which ran as #4 eastbound and #3 westbound) departed Houston at 9:45 pm and arrived in New Orleans at 7:20 am the following morning, while the westbound train departed New Orleans at 9:20 pm and arrived in Houston 7:10 am.  The Southern Pacific ended the "Acadian" in 1956.

Las Vegas Limited: The Las Vegas Limited was a short-lived weekend-only passenger train operated by Amtrak between Los Angeles, California, and Las Vegas, Nevada.  It was the last in series of excursion trains run by Amtrak between 1972–1976 serving the Los Angeles–Las Vegas market.  Low patronage led to the train's withdrawal after three months.  Amtrak returned to the Las Vegas market in 1979 with the "Desert Wind", a daily train between Los Angeles and Ogden, Utah.

New Mexican Railway Company: The New Mexican Railway Company was incorporated in the Territorial Legislature of New Mexico on Feb 2, 1860, prior to the beginning of the American Civil War.  Corporate members were Henry Connelly, Antonio J. Otero, who served as a justice of the New Mexico Territorial Supreme Court; Ambrosio Armijo (the father of Colonel Perfecto Armijo); José Felipe Chavez, Francisco Chavez; Spruce M. Baird, a judge sent by Texas during the U.S. provisional government of New Mexico to organize their claimed land east of the Rio Grande as the Santa Fe county of Texas; Francisco Perea, José Leandro Perea, who was the uncle of Francisco, Charles B. Clark, José Guadalupe Gallegos, Stephen Boice, William H. Moore, Ceran St. Vrain, Thomas C. de Baca, Merrill Ashurst, Duff Green, John Titus, David R. Porter, Oliver W. Barney, and Philip L. Fox.  The "Memorial of the New Mexican Railway Company, in Relation to the Pacific Railroad" was introduced by Miguel Antonio Otero in the United States Congress on May 21, 1860.  It was an argument in favor of the southern route for a transcontinental railroad.  Arguments over the central vs. southern route were a part of the complex of insoluble relations between states, dating back to James Gadsden's involvement in 1845 (as described in the discussion under the Gadsden Purchase).  These arguments contributed to the outbreak of the American Civil War.  The New Mexican Railway Company was formed in conjunction with the attempt to retain rights of in-state railroad construction oversight within the Territorial government.  The act of incorporation stated that company rights and privileges would be forfeited if construction had not begun within a period of five years.  Beginning in 1862, after the outbreak of Civil War, the Union Pacific Railroad and the Central Pacific Railroad of California were granted lands and construction privileges for the First Transcontinental Railroad project under the Pacific Railway Acts.  Construction of this Overland Route was begun in 1863 and completed in 1869.  The southern route did not become a reality until 1883, when the Southern Pacific Railroad linked New Orleans and the Gulf of Mexico with Los Angeles and the Pacific Ocean.

Argonaut (train): The Argonaut was the Southern Pacific Railroad's secondary passenger train between New Orleans and Los Angeles via Houston, San Antonio, and El Paso, Texas; Tucson, Arizona; and Palm Springs, California.  It started in 1926 on a 61 hr 35 min schedule Los Angeles to New Orleans, five hours slower than the Sunset Limited; it was discontinued west of Houston in 1958.  (It was also dropped from May 1932 until May 1936.)  In earlier years it carried sleeping cars from New Orleans to Yuma that would continue to San Diego via San Diego & Arizona Eastern, a SP subsidiary.  Westbound trains carried sleeping cars from New Orleans and Houston to San Antonio.

Southern Pacific 6051: Southern Pacific Railroad's (SP) number 6051 is an EMD E9 diesel locomotive.  It was one of nine E9s built for SP by EMD in December 1954 as Construction Number 20100 on SP Order Number P-1041 and EMD Order Number 2068.  It entered service on January 4, 1955 at Los Angeles.  These nine locomotives allowed the dieselization of the "Coast Daylight" and "Lark" passenger trains.  The units operated with E7s, ALCO PAs, and other passenger equipped diesels as required.  Assigned to the Los Angeles passenger pool for its entire career, it worked north via the Coast Line to San Francisco or east on the Sunset route to El Paso or New Orleans.  When SP and Rock Island began pooling locomotives on the Chicago-Los Angeles "Golden State" in 1967, it also worked those trains until they were discontinued the following year, often in mixed SP/Rock Island consists.  SP 6051 is the only surviving Southern Pacific passenger-dedicated diesel locomotive, and it currently resides at the California State Railroad Museum in Sacramento, California.  It's also used for train excursions.

Chipley station: Chipley station is a former intercity railroad station in Chipley, Florida.  It is currently the headquarters of the Washington County Historical Society.  The grounds include two former train stations: the Louisville and Nashville Depot and Bill Lee Station.  The station was served by Amtrak's "Sunset Limited" train until service was suspended after Hurricane Katrina struck in 2005.  Amtrak has proposed reopening the station as part of a restored "Sunset Limited" route in the future.

Skip Bolen: Skip Bolen is a Southern photographer of musicians, architecture, lifestyle and the culture of New Orleans.  Born in Lafayette, Louisiana, he moved to New Orleans where he began his publishing career as a designer and art director.  After moving to New York City, he began working at "House & Garden," renamed "HG," as Senior Designer in January 1988 with Anna Wintour and Alexander Liberman at Condé Nast Publications.  Spending evenings in jazz clubs, he began photographing jazz musicians in New York City and often when he regularly returned to New Orleans.  After three years at Condé Nast Publications in New York City, he returned to New Orleans to pursue his jazz photography full-time.  In 1998, he moved to Los Angeles where he became art director of House of Blues for seven years while photographing at night and weekends.  He continued photographing jazz musicians and had his first major solo exhibition at the Jazz Bakery in Los Angeles on August 9, 2002.  On July 4, 2006, he returned to New Orleans to pursue photography full-time documenting the recovery and rebuilding of New Orleans since Hurricane Katrina, documenting the jazz scene, night-time photography and other photographic projects.

James Hanley (1847–1916): James Hanley (1847–1916) was a railway man who became a member of the Los Angeles County Board of Supervisors and of the Los Angeles Common Council, the governing body of that city, in the late 19th Century.  He was the engineer on the first Southern Pacific transcontinental passenger train leaving from Los Angeles.

Sunset Limited: The Sunset Limited is a passenger train that for most of its history has run between New Orleans and Los Angeles, over the nation's second transcontinental route.

Piedmont Limited: The Piedmont Limited was a named passenger train operated by the Southern Railway in the southern United States.  For most of its life it was a New York—New Orleans train, operating over the same route as the more famous "Crescent Limited".  The Southern Railway introduced the train on March 12, 1899, and it was known as the crack train of the route until the introduction of the "Crescent" in 1925.  The Southern Railway discontinued the "Piedmont Limited" in 1976.

Supporting paragraphs: Chipley station Sunset Limited
Answer: Amtrak