Question: The Golden Triangle where the fortune of an American entrepreneur and engineer who invented what was made?
Context: Golden Triangle of Jakarta (Indonesian: "Segitiga Emas Jakarta" ) is roughly a triangular shape area of Jakarta, Indonesia, which extends from Central Jakarta to South Jakarta.  Most of the business, financial, and diplomatic establishments are located in the area, which also forms the center of the city.  The area is the main CBD of Jakarta, where most of the tallest skyscrapers are located.  The area is bordered by main avenues of Jakarta, Jalan M.H. Thamrin-Jalan Jenderal Sudirman (North-Southwest), Jalan H.R. Rasuna Said (North-Southeast), and Jalan Jenderal Gatot Subroto (East-West).  There are many other roads criss-crossing the area.  There are at least 3 main centers of commercial buildings such as SCBD (45 hectares), Mega Kuningan (54 hectares) and Kuningan Persada (17 hectares). Another cluster is "Rasuna Epicentrum", which is an area of 53.6 hectares, consisting of residential, offices, hotels, hospitals, places of worship, sports, shopping and entertainment and education in one area.  Golden triangle is one of the fastest evolving CBD in Asia-Pacific region. The Golden Triangle is a term commonly used by estate agents for the area of West and North Yorkshire lying between Harrogate, York and North Leeds.  The areas of the Golden Triangle are all part of the Leeds City Region.  Lying in the centre of this area is Wetherby on the fringes of West Yorkshire.  Despite usually being referred to as an affluent area the area consists of some deprived areas and many council estates such as Swarcliffe, Cranmer Bank and Hallfields. Golden Triangle Regional Airport (IATA: GTR, ICAO: KGTR, FAA LID: GTR) is a public use airport in Lowndes County, Mississippi, United States.  The airport is located midway between the cities of Columbus, Starkville, and West Point, Mississippi, and serves the area known as the Golden Triangle and the surrounding region of Mississippi.  GTR is mostly used for general and military aviation and for charter aircraft for college athletic teams visiting Mississippi State University, but is also served by a commercial airline, operating as Delta Connection. The Westplex is part of St. Charles County that used to be called “The Golden Triangle” .  The “Triangle” was formed by I-70 across the top, Missouri Route 94 to the east, and I-64 to the west.  With the three legs together, a triangle resting on its tip is formed.  Since almost all of the growth in St. Charles County was within this triangle it was dubbed the “Golden” area of St. Charles county, hence, Golden Triangle.  Today the Westplex is made up of St. Charles, St. Peters, Weldon Spring, Cottleville, Dardenne Prairie, O’Fallon, Lake St. Louis, Wentzville and St. Paul. MedCity (London) describes the collaboration between the Mayor of London and the capital's health science centres of three premier academic institutions Imperial College London, King's College London and University College London comprising the London part of the 'golden triangle'.  MedCity was launched in 2014 to increase collaboration between Imperial College, King’s College and University College London — the capital’s three main science universities — and promote the broader 'golden triangle' between London, Cambridge and Oxford to investors.  This collaboration is supported by HEFCE and London & Partners and works with the life sciences sector across the greater south-east of England. George Westinghouse Jr. (October 6, 1846 – March 12, 1914) was an American entrepreneur and engineer who invented the railway air brake and was a pioneer of the electrical industry, gaining his first patent at the age of 19.  Based in Pittsburgh, Pennsylvania for much of his career, Westinghouse was one of Thomas Edison's main rivals in the early implementation of the American electricity system.  Westinghouse's electricity distribution system, based on alternating current, ultimately prevailed over Edison's insistence on direct current.  In 1911 Westinghouse received the AIEE's Edison Medal "For meritorious achievement in connection with the development of the alternating current system." India's golden triangle is a tourist circuit which connects the national capital Delhi, Agra and Jaipur.  The Golden Triangle is so called because of the triangular shape formed by the locations of New Delhi, Agra and Rajasthan on a map.  The trips usually start in Delhi moving south to the site of Taj Mahal at Agra, then west, to the desert landscapes of Rajasthan.  It is normally possible to do the trip by coach or private journey through most tour operators.  The Golden Triangle is now a well traveled route providing a good spectrum of the country's different landscapes.  The circuit is about 720 km by road.  Each leg is about 4 to 6 hours of drive.  The Shatabdi express train also connects Delhi with Agra and Jaipur. Golden Triangle, Washington DC is a neighborhood and business improvement district(BID) in Washington, D.C. Its location encompasses most of Washington’s central business district, and runs from the front yard of the White House north to Dupont Circle and from 16th Street to 21st Street NW and includes sections of K Street and Connecticut Avenue.  The Golden Triangle BID was created in 1997 by the District of Columbia City Council and approved by Mayor Marion Barry.  The commercial neighborhood that is home to more than 3,000 organizations such as top law firms, lobbyists, associations, and architecture firms; 200 restaurants; 300 shops and retailers; 7 hotels; and 6 national parks.  Through a special assessment collected from property owners in a 43-block area, the Golden Triangle BID promotes and supports this area of downtown Washington DC through a number of services that include an Ambassador program focusing on cleanliness and hospitality, homeless outreach, streetscape improvements, marketing, outdoor summer concerts and other events, member services and more.  Businesses that are located within the boundaries of the Golden Triangle BID are automatically members of the BID.  The BID is governed by a Board of Directors composed of twenty-four property and business owners. Downtown Pittsburgh, colloquially referred to as the Golden Triangle or Dahntahn in eye dialect, and officially the Central Business District, is the urban downtown center of Pittsburgh.  It is located at the confluence of the Allegheny River and the Monongahela River whose joining forms the Ohio River.  The "triangle" is bounded by the two rivers.  The area features offices for major corporations such as PNC Bank, U.S. Steel, PPG, Bank of New York Mellon, Heinz, Federated Investors and Alcoa.  It is where the fortunes of such industrial barons as Andrew Carnegie, Henry Clay Frick, Henry J. Heinz, Andrew Mellon and George Westinghouse were made.  It contains the site where the French fort, Fort Duquesne, once stood. The Beaumont Golden Gators were a minor league baseball team in the double A Texas League from 1983 to 1986.  Owned by insurance man Ted Moor, the team was an affiliate of the San Diego Padres for their entire tenure.  Future Major League Baseball players John Kruk, Roberto Alomar, Joey Cora, Ozzie Guillén, Sandy Alomar, Jr., Shane Mack, and Benito Santiago all played at one time for the Golden Gators.  The team played its home games at Vincent-Beck Stadium on the campus of Lamar University in Beaumont, Texas and won the 1983 Texas League championship.  Their uniforms were a gaudy gold, white, and green and the hats were of the historic pillbox variety with a white B surrounded by a golden triangle.  The cities of Beaumont, Port Arthur, and Orange are known in local parlance as the "Golden Triangle."  The oil bust in 1986 caused the local economy to falter and Moor sold the team to a group that moved them to Wichita, Kansas before the 1987 season, becoming the Wichita Pilots.  The team spent 21 seasons in Wichita, being renamed to the Wichita Wranglers in 1989, before moving to Springdale, Arkansas and becoming the Northwest Arkansas Naturals.  Prior to their time in Beaumont the team had been the Amarillo Gold Sox.
Answer: railway air brake