Question: Pan Am Railways has a subsidiary in which former US Class I railroad in Maine?

Context paragraphs:
Maine Central Railroad Company: The Maine Central Railroad Company (reporting mark MEC) was a former U. S. Class I railroad in central and southern Maine.  It was chartered in 1856 and began operations in 1862.  By 1884, Maine Central was the longest railroad in New England.  Maine Central had expanded to 1,358 mi when the United States Railroad Administration assumed control in 1917.  The main line extended from South Portland, Maine, east to the Canada–United States border with New Brunswick, and a Mountain Division extended west from Portland to Vermont and north into Quebec.  The main line was double track from South Portland to Royal Junction, where it split into a "lower road" through Brunswick and Augusta and a "back road" through Lewiston which converged at Waterville into single track to Bangor and points east.  Branch lines served the industrial center of Rumford, a resort hotel on Moosehead Lake, and coastal communities from Bath to Eastport.

Seaboard System Railroad: The Seaboard System Railroad, Inc. was a short-lived former US Class I railroad that was created after the consolidation of the Family Lines System railroads (notably the Louisville & Nashville, Seaboard Coast Line, and Clinchfield) on December 29, 1982.  Under the Family Lines era, the railroads shared common ownership but used different names when conducting business.  On July 1, 1986, the Seaboard System renamed itself as CSX Transportation and absorbed the Chesapeake & Ohio Railway on August 31, 1987 which ended the CSX Corporation's shared ownership of the Seaboard System and Chessie System railroads.

Collective redress: Collective redress is a legal term used within the European Union to define the legal instrument of group proceedings as there is absolutely no regulation at the moment.  At the present the European Commission is working on a study to introduce European class action, similar to the US class action.

Maine Central Railroad main line: The Maine Central Railroad Company main line extended from Portland, Maine, east to the Canada–US border with New Brunswick at the Saint Croix-Vanceboro Railway Bridge.  It is the transportation artery linking Maine cities to the national railway network.  Sections of the main line had been built by predecessor railroads consolidated as the Maine Central in 1862 and extended to the Canada–US border in 1882.  Through the early 20th century, the main line was double track from South Portland to Royal Junction, where it split into a lower road through Brunswick and Augusta and a back road through Lewiston which converged at Waterville into single track to Bangor and points east.  Westbound trains typically used the lower road with lighter grades, while eastbound trains of empty cars used the back road.  This historical description does not include changes following purchase of the Maine Central Railroad by Guilford Transportation Industries in 1981 and subsequent operation as part of Pan Am Railways.

James Smith Bush: Rev. James Smith Bush (June 15, 1825 – November 11, 1889) was an American attorney, Episcopal priest, religious writer, and an ancestor of the Bush political family.  He was the father of business magnate Samuel Prescott Bush, grandfather of former US Senator Prescott Bush, great-grandfather of former US President George H. W. Bush and great-great-grandfather of former US President George W. Bush.

Norfolk and Western Railway: The Norfolk and Western Railway (reporting mark NW) , was a US class I railroad, formed by more than 200 railroad mergers between 1838 and 1982.  It was headquartered in Roanoke, Virginia, for most of its existence.  Its motto was "Precision Transportation"; it had a variety of nicknames, including "King Coal" and "British Railway of America" even though the N&W had mostly articulated steam on its roster.  During the Civil War, the N&W was the biggest railroad in the south and moved most of the products with their steam locomotives to help the South the best way they could.

New York State Railways: New York State Railways was a subsidiary of the New York Central Railroad that controlled several large city streetcar and electric interurban systems in upstate New York.  It included the city transit lines in Rochester, Syracuse, Utica, Oneida and Rome, plus various interurban lines connecting those cities.  New York State Railways also held a 50% interest in the Schenectady Railway Company, but it remained a separate independent operation.  The New York Central took control of the Rochester Railway Company, the Rochester and Eastern Rapid Railway and the Rochester and Sodus Bay Railway in 1905, and the Mohawk Valley Company was formed by the railroad to manage these new acquisitions.  New York State Railways was formed in 1909 when the properties controlled by the Mohawk Valley Company were merged.  In 1912 it added the Rochester and Suburban Railway, the Syracuse Rapid Transit Railway, the Oneida Railway, and the Utica and Mohawk Valley Railway.  The New York Central Railroad was interested in acquiring these lines in an effort to control the competition and to gain control of the lucrative electric utility companies that were behind many of these streetcar and interurban railways.  Ridership across the system dropped through the 1920s as operating costs continued to rise, coupled with competition from better highways and private automobile use.  New York Central sold New York State Railways in 1928 to a consortium led by investor E. L. Phillips, who was looking to gain control of the upstate utilities.  Phillips sold his stake to Associated Gas & Electric in 1929, and the new owners allowed the railway bonds to default.  New York State Railways entered receivership on December 30, 1929.  The company emerged from receivership in 1934, and local operations were sold off to new private operators between 1938 and 1948.

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Pan Am Railways: Pan Am Railways, Inc. (PAR), formerly known as Guilford Rail System (GRS) before March 2006, is an American holding company that owns and operates Class II regional railroads covering northern New England from Mattawamkeag, Maine, to Rotterdam Junction, New York.  The primary subsidiaries of Pan Am Railways are Boston and Maine Corporation (reporting mark BM) , Maine Central Railroad Company (reporting mark MEC) , Portland Terminal Company (reporting mark PTM) , and Springfield Terminal Railway Company (reporting mark ST) ; BM and MEC are operated under lease by ST.

St. Louis Southwestern Railway: The St. Louis Southwestern Railway (reporting mark SSW) , known by its nickname of "The Cotton Belt Route" or simply Cotton Belt, is a former US Class I railroad which operated between St. Louis, Missouri, and various points in the states of Arkansas and Texas from 1891 to 1992.

Supporting paragraphs: Pan Am Railways Maine Central Railroad Company
Answer: Maine Central Railroad Company