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The Burlington Northern Railroad (AAR reporting mark BN) was a United States-based railroad operating between 1970 and 1995.
The Burlington Northern was the product of a 1970 merger comprising the Great Northern Railway; the Northern Pacific Railway; the Chicago, Burlington and Quincy Railroad; and the Spokane, Portland, and Seattle Railway.
The Burlington Northern's locomotive livery painted the top quarter or so of the locomotive black and the rest green, with a white 'BN' logo. Often, the front of the locomotive was striped with white and green for visibility.
In 1995, the Burlington Northern merged with the Atchison, Topeka and Santa Fe Railway (ATSF) to form the new Burlington Northern Santa Fe Railway (BNSF), possibly the largest railroad in the United States by track mileage.
The Burlington Northern traversed the most northerly route of any railroad in the western United States. This route started at Chicago, Illinois and ran west-northwest to La Crosse, Wisconsin. From here the route continued northwest through Minneapolis and St. Paul, Minnesota to Grand Forks, North Dakota. From Grand Forks the route ran west through North Dakota, Montana, and Idaho to Spokane, Washington. At Spokane the route split into two routes, one going to Seattle, Washington and another to Portland, Oregon. This route required construction of the Flathead Tunnel through the Rocky Mountains in Montana and the Cascade Tunnel through the Cascade Mountains in Washington.