Denver & Rio Grande Western K-28 is a class of ten narrow gauge 2-8-2, Mikado type, steam railway locomotives, built as Passenger locomotives in 1923 by the Schenectady Locomotive Works of the American Locomotive Company for the Denver & Rio Grande Railroad.
 They were the first new narrow gauge locomotives ordered by the railroad since 1903.
 They initially comprised class E-4-148-S, but were reclassified K-28 in 1924 when the railroad reorganized into the Denver & Rio Grande Western Railroad.
The steam locomotives of DR Class 99.77–79 were ordered by the Deutsche Reichsbahn in East Germany after the Second World War.
 They were narrow gauge locomotives with a 750 mm rail gauge and were built for the narrow gauge lines in Saxony.
 The locomotives were largely identical to the DRG Class 99.73–76 standard locomotives ("Einheitslokomotiven") built in the 1930s.
 To differentiate them from their predecessors they were described as "Neubaulokomotiven" or newly designed engines.
The Saint Louis Zoological Park, commonly known as the Saint Louis Zoo, is a zoo in Forest Park in St. Louis, Missouri, United States.
 It is recognized as a leading zoo in animal management, research, conservation, and education.
 The zoo is accredited by the Association of Zoos and Aquariums (AZA).
 Admission is free based on a public subsidy from a cultural tax district, the Metropolitan Zoological Park and Museum District (ZMD); fees are charged for some special attractions.
 A special feature is the narrow gauge Emerson Zooline Railroad with passenger trains pulled by Chance Rides C.P. Huntington locomotives that encircle the zoo, stopping at the more popular attractions.
The Los Angeles Live Steamers Railroad Museum (LALSRM) is a non-profit public-benefit corporation founded in 1956 by live steam enthusiasts for the purpose of educating the public about railroad history and lore, and to promote live steam and scale model railroad technology.
 The museum is located in Griffith Park in Los Angeles, California and is open from 11 a.m. to 3 p.m. every Sunday weather permitting.
 In 1956, all of the model locomotives were steam-powered, hence the name "Live Steamers".
 Over the years, gasoline-powered models of diesel locomotives and battery-electric locomotives and trolleys have also become popular.
 The museum operates a gauge miniature railway on which these locomotives pull trains that the public can ride.
The Eagles Mere Railroad was a narrow gauge railroad in Sullivan County, Pennsylvania, built in 1892 to connect the resort of Eagles Mere with the standard gauge Williamsport and North Branch Railroad at Sonestown, 8 mi away by rail.
 It was leased to the connecting Williamsport & North Branch in 1901, which continued to operate it as a narrow gauge, and extended it in 1902–3 to Eagles Mere Park and a connection with the narrow gauge Susquehanna and Eagles Mere Railroad, a logging railroad.
 The line went through a receivership and reorganization in 1911–2, and a second in 1920, due to increasing competition with automobiles for traffic to Eagles Mere.
 It was reorganized again in 1922 as the Eagles Mere Railway, operating independently of the W&NB, but ended passenger service in 1923 and freight service in 1927.
 It was abandoned in 1928.
La Trochita (official name: Viejo Expreso Patagónico), in English known as the Old Patagonian Express, is a narrow gauge railway in Patagonia, Argentina using steam locomotives.
 The nickname "La Trochita" means literally "little gauge" though it is sometimes translated as "The Little Narrow Gauge" in Spanish while "trocha estrecha" is often used for a generic description of "narrow gauge."
Chance Rides Manufacturing is a roller coaster and amusement ride manufacturer.
 The company was formed on May 16, 2002, when the former Chance Industries Inc. emerged from bankruptcy.
 The main office and manufacturing facility are located in Wichita, Kansas.
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.
The Western River Railroad (reporting mark WRR) is a narrow gauge rail transport attraction in Tokyo Disneyland.
 Its route is 5,283 ft long and does not circle the whole park; it instead passes through Adventureland, Westernland, and Critter Country.
 Additionally, this railroad differs from other Disney railroads because its track gauge is narrow gauge as compared with other Disney railroad track gauges of narrow gauge.
 At the time that the Western River Railroad was opened, Japanese rail regulations required that any railway line with more than one stop be subject to the same rules as any other conventional rail line.
 As such, there is only one stop on the Western River Railroad in order to avoid having to charge fares and to allow the use of passenger cars that are not fully enclosed, which would not be allowed otherwise.
 It was sponsored by Takara Tomy.
The gauge for the most of the China national railway network is standard gauge.
 Currently, in the national railway network, only the Kunming–Hai Phong Railway uses narrow gauge.
 In addition, there are some industrial lines still using narrow gauge, mostly narrow gauge or narrow gauge.
 As of 2003, 600+ km narrow-gauge railways, 50000+ km standard gauge railways, and 9.4 km broad gauge railways were in use in mainland China.

Question: Where are the main offices of the company whose locomotives pull the narrow gauge Emerson Zooline Railroad?
Answer: Wichita, Kansas