Question: In what country did the railway operate that served both Denver and the city where the employer of Jesús Castro-Balbi is located?

full_context: Document 1: History of rail transportation in the United States: Railroads played a large role in the development of the United States from the industrial revolution in the North - east (1810 -- 1850) to the settlement of the West (1850 -- 1890). The American railroad mania began with the Baltimore and Ohio Railroad in 1826 and flourished until the Panic of 1873 bankrupted many companies and temporarily ended growth.
Document 2: Stonegate Mansion: The Stonegate Mansion is located at the edge of the Stonegate neighborhood in Fort Worth, TX near the Texas Christian University campus on a hill overlooking downtown Fort Worth. Built by multimillionaire oilman T. Cullen Davis, the mansion, once a private home, has been a restaurant, a church and most recently has been renovated to become an event facility used for weddings, parties, meetings and charitable events.
Document 3: John A. Snively: During the 1940s, Snively built Magnolia Mansion, a stately New Orleans style home on the shores of Lake Eloise, on Winter Haven's famous Chain of Lakes. Magnolia Mansion was purchased by Cypress Gardens theme park in the 1970s.
Document 4: Jesús Castro-Balbi: Jesús Castro-Balbi is a French and American cellist who performs internationally and is the Cello Professor at Texas Christian University. Born in Spain of Peruvian parents, he was raised in France and moved to the United States in 1996.
Document 5: André Navarra: André-Nicolas Navarra (13 October 1911 Biarritz, France – 31 July 1988 Siena, Italy) was a French cellist and cello teacher.
Document 6: Tucson, Arizona: Southeast Tucson continues to experience rapid residential development. The area includes Davis-Monthan Air Force Base. The area is considered to be south of Golf Links Road. It is the home of Santa Rita High School, Chuck Ford Park (Lakeside Park), Lakeside Lake, Lincoln Park (upper and lower), The Lakecrest Neighborhoods, and Pima Community College East Campus. The Atterbury Wash with its access to excellent bird watching is also located in the Southeast Tucson area. The suburban community of Rita Ranch houses many of the military families from Davis-Monthan, and is near the southeastern-most expansion of the current city limits. Close by Rita Ranch and also within the city limits lies Civano, a planned development meant to showcase ecologically sound building practices and lifestyles.
Document 7: William T. Ogden House: William T. Ogden House is a historic Neo-Classical Georgian style brick mansion located on in Stirling, Alberta, Canada. Construction of the house began in 1910 and was finished in 1919 by William T. Ogden. The house has been a rooming house, pool hall and a dance studio, and in 1934 it became a temporary school for grades 1 through 4 due after the local school was affected by fire. This home is actually mentioned in village records as thought to be haunted as far back as the 1950s. Every Halloween, the owners conduct Stirling Haunted Mansion tours, making it the largest haunted house in Southern Alberta. The Santa Claus Mansion event is held there each December in conjunction with a Christmas lights tour. A gauge mini railroad, the Lost Frontier Mini-Railway, winds its way around the estate.
Document 8: Luisa Castro: Luisa Castro (born 1966, in Foz, Lugo) is a Spanish writer and journalist who has published in Galician and Spanish. She has lived in Barcelona, New York City, Madrid and Santiago de Compostela. She is currently Director of the Instituto Cervantes in Bordeaux, France.
Document 9: Fort Worth and Denver Railway: The Fort Worth and Denver Railway , nicknamed "the Denver Road," was a Class I American railroad company that operated in the northern part of Texas from 1881 to 1982, and had a profound influence on the early settlement and economic development of the region.
Document 10: Kristin Espinasse: Kristin Espinasse was born in the southwestern USA and completed a liberal arts degree at Arizona State University. She met her husband Jean-Marc in Aix-en-Provence while on an exchange program in France. She moved to France in 1992. Her mother Jules lives in Mexico.
Document 11: Colorado Territory: In the meantime, the territory found itself threatened by lack of railroads. By the late 1860s, many in Denver had sold their businesses and moved northward to the Dakota Territory communities of Laramie and Cheyenne, which had sprung up along the transcontinental railroad. Faced with the possible dwindling of the town and its eclipse by the new towns to the north, Denverites pooled their capital and built the Denver Pacific Railroad northward to Cheyenne to bring the rail network to Denver. The Kansas Pacific Railway was completed to Denver two months later. The move cemented the role of Denver as the future regional metropolis. The territory was finally admitted to the Union in 1876.
Document 12: Raleigh, North Carolina: Downtown area is home to historic neighborhoods and buildings such as the Sir Walter Raleigh Hotel built in the early 20th century, the restored City Market, the Fayetteville Street downtown business district, which includes the PNC Plaza and Wells Fargo Capitol Center buildings, as well as the North Carolina Museum of History, North Carolina Museum of Natural Sciences, North Carolina State Capitol, Peace College, the Raleigh City Museum, Raleigh Convention Center, Shaw University, and St. Augustine's College. The neighborhoods in Old Raleigh include Cameron Park, Boylan Heights, Country Club Hills, Coley Forest, Five Points, Budleigh, Glenwood-Brooklyn, Hayes Barton Historic District, Moore Square, Mordecai, Rosengarten Park, Belvidere Park, Woodcrest, and Historic Oakwood. In the 2000s, an effort by the Downtown Raleigh Alliance was made to separate this area of the city into five smaller districts: Fayetteville Street, Moore Square, Glenwood South, Warehouse (Raleigh), and Capital District (Raleigh). Some of the names have become common place among locals such as the Warehouse, Fayetteville Street, and Glenwood South Districts.
Document 13: El Paso and Northeastern Railway: The El Paso and Northeastern Railway (EP&NE) was a short line railroad that was built around the beginning of the twentieth century to help connect the industrial and commercial center at El Paso, Texas, with physical resources and the United States' national transportation hub in Chicago. Founded by Charles Eddy, the EP&NE was the primary railroad in a system organized under the New Mexico Railway and Coal Company (NMRy&CCo), a holding company which owned several other railroads and also owned mining and industrial properties served by the lines.
Document 14: Montana: Railroads have been an important method of transportation in Montana since the 1880s. Historically, the state was traversed by the main lines of three east-west transcontinental routes: the Milwaukee Road, the Great Northern, and the Northern Pacific. Today, the BNSF Railway is the state's largest railroad, its main transcontinental route incorporating the former Great Northern main line across the state. Montana RailLink, a privately held Class II railroad, operates former Northern Pacific trackage in western Montana.
Document 15: André Hekking: Born in Bordeaux, he studied with Charles Auguste de Bériot, touring Spain at fifteen. In 1909, he settled in Paris to become a teacher of the cello, having in the meantime gained a reputation throughout Europe as a virtuoso. He joined the faculty of the Conservatoire de Paris in 1918 and became a professor a year later. He also taught at the American Conservatory in Fontainebleau.
ground_truth: America
sub_queries: Jesús Castro-Balbi >> employer Answer: Texas Christian University
Texas Christian University >> located in the administrative territorial entity Answer: Fort Worth
Fort Worth and Denver Railway >> country Answer: America