Question: What kind of cargo does Union Pacific Railroad that Iowa State Representative Matt W. Windschitl worked for haul?

Context paragraphs:
Denver, South Park and Pacific Railroad: The Denver, South Park, and Pacific Railroad (later called the Denver, Leadville and Gunnison Railway) was a historic narrow gauge railroad that operated in Colorado in the western United States in the late 19th century.  The railroad opened up the first rail routes to a large section of the central Colorado mining district in the decades of the mineral boom.  The railroad took its name from the fact that its main line from Denver ascended the Platte Canyon and traversed South Park.  Founded in 1872 by Colorado Governor John Evans, the company was purchased by the Union Pacific Railway in 1880, though it continued to be operated independently.  The line went bankrupt in 1889 and was reorganized under the new moniker the Denver, Leadville and Gunnison Railway.  When the Union Pacific went bankrupt in 1893, the DL&G lines went into receivership and were eventually sold to the Colorado and Southern Railway.  In the first half of the 20th century, nearly all the company's original lines were dismantled or converted into .  The last train to run the old DSP&P tracks was from Como, Colorado on April 11, 1937.  A section of the standard gauge line between Leadville and Climax is still operated as a passenger excursion railroad called the Leadville, Colorado and Southern Railroad.  At its peak the Denver, South Park and Pacific Railroad had 335 mi of narrow gauge line, making it the largest narrow gauge railroad in the state of Colorado.

Union Pacific Railroad: The Union Pacific Railroad (or Union Pacific Railroad Company and simply Union Pacific) is a freight hauling railroad that operates 8,500 locomotives over 32,100 route-miles in 23 states west of Chicago and New Orleans.  The Union Pacific Railroad system is the largest in the United States and it is one of the world's largest transportation companies.  The Union Pacific Railroad is the principal operating company of the Union Pacific Corporation (); both are headquartered in Omaha, Nebraska.

Western Pacific Railroad: The Western Pacific Railroad (reporting mark WP) 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 directly competed with SP's portion of the Overland Route for rail traffic between Salt Lake City/Ogden, Utah and Oakland, California for nearly 80 years.  In 1983, the Western Pacific was acquired by the Union Pacific Corporation and it was soon merged into their Union Pacific Railroad.  The Western Pacific was one of the original operators of the "California Zephyr".

Sioux City and Pacific Railroad: The Sioux City and Pacific Railroad was a railroad in the U.S. states of Iowa and Nebraska.  Built as a connection from Sioux City, Iowa to the Union Pacific Railroad at Fremont, Nebraska, it became part of the Chicago and North Western Railway system in the 1880s, and is now a main line of the Union Pacific (UP).  The east-west portion from Fremont to Missouri Valley, Iowa, is the Blair Subdivision, carrying mainly westbound UP trains (most eastbounds use the Omaha Subdivision), and the line from California Junction, Iowa north to Sioux City is the Sioux City Subdivision.

Matt Windschitl: Matt W. Windschitl (born December 30, 1983) is the Iowa State Representative from the 17th District.  A Republican, he has served in the Iowa House of Representatives since 2007, when he defeated Republican incumbent Paul Wilderdyke in a primary election.  Windschitl studied gunsmithing at the Colorado School of Trades.  He is a gunsmith and a conductor with the Union Pacific Railroad.  He is also United States Marine Reservist and served a six-month tour in Iraq.

History of railroads in Colorado: The history of rail transportation in Colorado began with the competition between two separate railways in the late 1860s the Denver Pacific Railroad and the Colorado Central and Pacific Railroad.  Following the decision of the Union Pacific Railroad to route the transcontinental railroad through Cheyenne, Wyoming instead of Denver, the first town in the Front Range area to construct a connecting line to the Union Pacific Railroad would more naturally become the economic focus of the Colorado territory.  The Colorado Central and Pacific Railway was incorporated in 1865 by residents of Golden, however this railway was unable to immediately begin constructing a connecting line to Cheyenne.  The existence of the Colorado Central and Pacific Railroad prompted the citizens of Denver to incorporate the Denver Pacific Railroad on November 19, 1867.  Following a spirited campaign raising capital, the Denver Pacific Railroad laid its first track in 1869.  By June 26, 1870, the Denver Pacific Railroad was completed.

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.

Overland Route (Union Pacific Railroad): The Overland Route was a train route operated jointly by the Union Pacific Railroad and the Central Pacific Railroad / Southern Pacific Railroad, between Council Bluffs, Iowa / Omaha, Nebraska, and San Francisco, California over the grade of the First Transcontinental Railroad (aka the ""Pacific Railroad"") which had been opened on May 10, 1869.  Passenger trains that operated over the line included the "Overland Flyer", later renamed the "Overland Limited", which also included a connection to Chicago.  Although these passenger rail trains are no longer in operation, the Overland Route remains a common name for the line from California to Chicago, now owned entirely by the Union Pacific.

Central Branch Union Pacific Railroad: The Central Branch Union Pacific Railroad was a railroad in the U.S. state of Kansas.  Originally planned as a line from Atchison west into Colorado, and given federal land grants by the Pacific Railway Act of 1862 as one of the branches of the Union Pacific Railroad, it was left with a hanging end at Waterville, Kansas when the Union Pacific Railway, Eastern Division, with which it was to connect, changed its route.  The line was acquired by the Union Pacific through a stock purchase by Jay Gould and leased to the Missouri Pacific Railroad in 1880.  In 1909 the Central Branch was merged into the Missouri Pacific; the latter company came back into the Union Pacific system in 1982.  In 1991 the remaining trackage west of Frankfort was leased to the Kyle Railroad.

Feather River Route: The Feather River Route is a rail line that was built and operated by the Western Pacific Railroad.  It was constructed between 1906 and 1909, and connects the cities of Oakland, California, and Salt Lake City, Utah.  The line was built to compete with the Central Pacific Railroad (and later Southern Pacific Railroad), which at the time held a nearly complete monopoly on Northern California rail service.  The route derives its name from its crossing of the Sierra Nevada, where it follows both the North and Middle Forks of the Feather River.  The route is famous for its impressive engineering qualities and its considerable scenic value.  All of the route is now owned and operated by the Union Pacific Railroad; however, the Union Pacific has transferred significant portions of the route to other lines.  The portion still called the Feather River Route by the Union Pacific runs from the California Central Valley to Winnemucca, Nevada.

Supporting paragraphs: Matt Windschitl Union Pacific Railroad
Answer: a freight hauling railroad that operates 8,500 locomotives