Answer the following question: What are the acronyms of Manitoba's two Class I railways?  Answer the above question based on the context below:  Transportation and warehousing contribute approximately C$2.2 billion to Manitoba's GDP. Total employment in the industry is estimated at 34,500, or around 5 percent of Manitoba's population. Trucks haul 95 percent of land freight in Manitoba, and trucking companies account for 80 percent of Manitoba's merchandise trade to the United States. Five of Canada's twenty-five largest employers in for-hire trucking are headquartered in Manitoba. C$1.18 billion of Manitoba's GDP comes directly or indirectly from trucking.Greyhound Canada and Grey Goose Bus Lines offer domestic bus service from the Winnipeg Bus Terminal. The terminal was relocated from downtown Winnipeg to the airport in 2009, and is a Greyhound hub. Municipalities also operate localized transit bus systems. Manitoba has two Class I railways: Canadian National Railway (CN) and Canadian Pacific Railway (CPR). Winnipeg is centrally located on the main lines of both carriers, and both maintain large inter-modal terminals in the city. CN and CPR operate a combined 2,439 kilometres (1,516 mi) of track in Manitoba. Via Rail offers transcontinental and Northern Manitoba passenger service from Winnipeg's Union Station. Numerous small regional and short-line railways also run trains within Manitoba: the Hudson Bay Railway, the Southern Manitoba Railway, Burlington Northern Santa Fe Manitoba, Greater Winnipeg Water District Railway, and Central Manitoba Railway. Together, these smaller lines operate approximately 1,775 kilometres (1,103 mi) of track in the province.
Answer:
CN