Question: The CNR Bonnet Carré Spillway-Baton Rouge Bridge is a 1.3 mile (2,092 m or 6,864 ft) bridge that carries which rail line, of Canadian Class I freight railway headquartered in Montreal, Quebec that serves Canada and the Midwestern and Southern United States?
Context: Canada has a large and well-developed railway system that today transports primarily freight.  There are two major publicly traded transcontinental freight railway systems, Canadian National and Canadian Pacific.  Nationwide passenger services are provided by the federal crown corporation Via Rail.  Three Canadian cities have commuter train services: in the Montreal area by Réseau de transport métropolitain, in the Toronto area by GO Transit, and in the Vancouver area by West Coast Express.  These cities and several others are also served by light rail or metro systems.  Only one (Toronto) has an extensive streetcar (tram) system.  Smaller railways such as Ontario Northland Railway and Algoma Central Railway also run passenger trains to remote rural areas.  The Rocky Mountaineer and Royal Canadian Pacific provide luxury rail tours for viewing scenery in the Canadian Rockies as well as other mountainous areas of British Columbia and Alberta. The Central Rail Line (Polish: "Centralna Magistrala Kolejowa" , "CMK", also known in Poland as the "Rail Line No. 4", Polish: "Linia kolejowa nr 4"), was completed on 23 December 1977 could have been the first high speed railway line in Europe.  Designed for speeds of up to 250 km/h, the line goes from the city of Zawiercie in Zagłębie Dąbrowskie region of southern Poland, to Grodzisk Mazowiecki in the suburbs of Warsaw.  Its length is 224 kilometers, and in the Polish rail system it is officially known as "Rail Line Number 4" ("Linia kolejowa numer 4").  The line was originally built for rail freight transport, but it now carries InterCity and EuroCity long distance passenger services, mostly from Katowice and Kraków to Warsaw. The CNR Bonnet Carré Spillway-Baton Rouge Bridge is a 1.3 mile (2,092 m or 6,864 ft) bridge that carries a Canadian National Railway rail line over the Bonnet Carré Spillway in St. Charles Parish.  Its length makes it one of the longest bridges in the world. The Kansas City Southern Bonnet Carré Spillway Bridge is a bridge that carries a Kansas City Southern Railway rail line over the Bonnet Carré Spillway in St. Charles Parish.  At 1.8 mi long or (9,501 ft), it is one of the longest bridges in the world. The Canadian National Railway Company (French: "Compagnie des chemins de fer nationaux du Canada" ) is a Canadian Class I freight railway headquartered in Montreal, Quebec that serves Canada and the Midwestern and Southern United States.  CN's slogan is ""North America's Railroad"".  CN is a public company with 24,000 employees.  It had a market capitalization of 32 billion CAD in 2011.  CN was government-owned, having been a Canadian Crown corporation from its founding to its privatization in 1995.  Bill Gates was, in 2011, the largest single shareholder of CN stock. Kennington Railway Bridge is a railway bridge over the River Thames near Kennington, Oxfordshire between Sandford Lock and Iffley Lock.  It carries the freight railway branch line that serves the BMW Mini factory at Cowley.  The freight railway is part of the former Wycombe Railway that linked and via and . The CNR Bonnet Carré Spillway-McComb Bridge is a 2.3 mile (3,701 m or 12,144 ft), bridge that carries a Canadian National Railway rail line over the Bonnet Carré Spillway and a portion of Lake Pontchartrain in St. Charles Parish and St. John the Baptist Parish.  Its length makes it one of the longest bridges in the world. The Yiwu – London Railway Line is a freight railway route from Yiwu, China, to London, United Kingdom, covering a distance of roughly 12,000 km (7,456 miles).  This makes it the longest railway freight route in the world.  It is one of several long distance freight railway routes from China to Europe on the “New Eurasian Land Bridge” and part of establishing a modern-day Silk Road.  The route was opened on the 1st of January 2017, making London the 15th European city to have a railway route connection with China, and takes 18 days to complete (other European cities with China-Europe railway routes include Hamburg, Madrid, Rotterdam, Warsaw, etc.). The Gananoque River Bridge is a railway bridge across the Gananoque River in the municipality of Leeds and the Thousand Islands, United Counties of Leeds and Grenville in eastern Ontario, Canada, located between Montreal and Toronto at mile 155.9 in the Canadian National Railway Kingston subdivision.  It consists of four identical spans carrying single track supported on common piers and abutments and was built in 1902–1903 according to Grand Trunk Railroad specifications of 1900.  The bridge carries all CN freight traffic between Toronto and Montreal, and all Via Rail Corridor passenger rail traffic between Toronto and Ottawa/Montreal. The I-10 Bonnet Carré Spillway Bridge is a twin concrete trestle bridge in the U.S. state of Louisiana.  With a total length of 17,702 m or 58,077 ft, it is one of the longest bridges in the world.  The bridge carries Interstate 10 over the Bonnet Carré Spillway, Lake Pontchartrain and LaBranche Wetlands in St. Charles Parish and a portion of St. John the Baptist Parish.  The bridge opened in 1972.
Answer: Canadian National Railway Company