Question: The Bangor and Aroostook Railroad brought rail service to which state?
Context: The Bangor and Aroostook Railroad (BAR) of northern Maine was at the northeastern tip of the United States rail network.  Its location offered no bridge traffic between other railways, but required dependable service when winter weather made transportation difficult.  Potato loadings peaked during winter months, and a fleet of ten-wheelers built by Manchester Locomotive Works provided reliable service through the early 20th century.  Consolidations for the heavier winter freight service were built at other American Locomotive Company (ALCO) plants.  Potato traffic remained relatively constant through the great depression, and declining bridge traffic revenues which brought insolvency to other railroads were irrelevant to BAR.  BAR provided reliable paychecks attracting competent maintenance personnel, and continued to replace older engines with modern steam locomotives through 1945.  As less fortunate railroads began replacing their worn-out steam power with modern diesel locomotives, BAR initially purchased a number of used modern steam locomotives from railroads converting to diesel power. The Bangor and Aroostook Railroad (reporting mark BAR) was a United States railroad company that brought rail service to Aroostook County in northern Maine.  Brightly painted BAR box cars attracted national attention in the 1950s.  First-generation diesel locomotives operated on BAR until they were museum pieces.  The economic downturn of the 1980s coupled with the departure of heavy industry from northern Maine forced the railroad to seek a buyer and end operations in 2003. Scopan Lake is a "V" shaped lake in northern Maine.  The lake was known as Squa Pan Lake by early European settlers, but was renamed in 2011 to eliminate what Native Americans in the United States interpreted as a racial slur.  The lake is mostly in Scopan township (formerly Squapan township), but the north end of the eastern arm of the "V" extends into Maine township 11, range 4; and the north end of the western arm extends into Masardis and Ashland.  The lake discharges to Scopan Stream (formerly Squa Pan Stream) through a dam in Masardis.  Scopan Stream flows into the Aroostook River 4 mi downstream of the dam, and the Aroostook River is a tributary to the Saint John River.  The Bangor and Aroostook Railroad crosses the northern tip of both arms of the lake. Frederic C. "Buck" Dumaine Jr. (1902 – March 13, 1997 in Weston, Massachusetts ) was an American business executive who served as the president of the New York, New Haven and Hartford Railroad from 1951–1954, Avis Rent a Car System from 1957–1962, and the Delaware and Hudson Railroad from 1967-1968.  He also served as an executive with the American Woolen Company, Lehigh Coal and Navigation Company, Waltham Watch Company, Fanny Farmer, Boston Edison Company, Bangor and Aroostook Railroad, Pittsburg and Shawmut Railroad, Boston and Maine Railroad, Boston Garden-Arena Corporation, and Springfield and Eastern Street Railway. The Frenchville Railroad Station and Water Tank are a historic railroad museum property in Frenchville, Maine.  The station and water tank were built in 1910 by the Bangor & Aroostook Railroad (B&A) and were added to the National Register of Historic Places on June 20, 1995.  The station was retired in 1971.  The water tower became obsolete in 1958 when the diesel locomotive replaced the steam locomotive.  The Town of Frenchville purchased the water tank from "Bangor & Aroostook Railroad" and used it as a water reservoir for the fire department until 1981.  The Frenchville Historical Society took over maintenance of the site in 1985. Bangor Union Station was a passenger train station in Bangor, Maine, served by the Maine Central Railroad and the Bangor and Aroostook Railroad.  It was the second largest railroad station in Maine until it was demolished on 30 November 1961 following termination of passenger service earlier that year by both railroads serving Bangor.  Demolition avoided an annual property tax of $10,788 on an assessed valuation of $372,000.  The station site is now occupied by the Penobscot Plaza Shopping Center. The Metro-North Commuter Railroad (reporting mark MNCW) , trading as MTA Metro-North Railroad or simply Metro-North, is a suburban commuter rail service run by the Metropolitan Transportation Authority (MTA), a public authority of the state of New York.  With an average weekday ridership of 298,900 in 2014, it is the second-busiest commuter railroad in North America in terms of annual ridership, behind its sister railroad, the Long Island Rail Road.  Metro-North runs service between New York City and its northern suburbs in New York and Connecticut, including Port Jervis, Spring Valley, Poughkeepsie, White Plains, and Wassaic in New York and New Canaan, Danbury, Waterbury, and New Haven in Connecticut.  Metro-North also provides local rail service within New York City at a reduced fare.  There are 124 stations on Metro-North Railroad's five active lines (plus the Meadowlands Rail Line), which operate on more than 775 mi of track, with the passenger railroad system totaling 385 mi of route. The Washington County Railroad (reporting mark WACR) is a shortline railroad operating in Vermont, forming part of the Vermont Rail System.  The WACR began operating in 1980 over the old Montpelier and Barre Railroad in Washington County, which the state acquired to ensure the continuance of rail service, and ceased operations in early 1999.  Later that year, after interim service by other companies, operations were transferred to a new WACR subsidiary of the Vermont Rail System.  In 2003, operations were greatly expanded through acquisition by the state and operation by the WACR of a former Boston and Maine Corporation and Canadian Pacific Railway line between Newport and White River Junction, which had most recently been operated by subsidiaries of the bankrupt Bangor and Aroostook Railroad. Oakfield Station is a historic former passenger rail station on Station Street in Oakfield, Maine.  The station was built in 1911 by the Bangor and Aroostook Railroad, and is a major reminder of Oakfield's onetime importance as a railroad center.  The station is home to the Oakfield Railroad Museum which is operated by the Oakfield Historical Society.  It was listed on the National Register of Historic Places on June 25, 1987. Derby (formerly known as Milo Junction) is the name of railroad repair facilities in Milo, Maine.  In 1905, it was described by the Bangor Daily Commercial as being the second-largest repair shops in New England, as built by the Bangor & Aroostook Railroad.
Answer: in northern Maine