The Sunflour Railroad (reporting mark SNR) is a short-line railroad which owns trackage in Roberts County and Marshall County, South Dakota. The company owns approximately 26.3 route-miles of track, between the towns of Rosholt and Veblen; the line connects with the Canadian Pacific Railway at Rosholt.
The trackage now owned by Sunflour was originally constructed in 1913 by the Fairmount and Veblen Railway, a local shortline which extended from Fairmount, North Dakota to Grenville, South Dakota. The railway was soon purchased by the Soo Line Railroad, and operated as a branch line; the portion of the branch beyond Veblen to Grenville was abandoned in 1971. Sunflour purchased the Rosholt-Veblen trackage in 2000, after the Soo Line had requested permission to abandon that portion of the route.
The Sunflour Railroad apparently operated for only a short time, although the trackage remains intact in 2006. The railroad's only locomotive, an EMD SW1 switcher, currently rests on a siding at Victor, South Dakota. This was an optional name in the developing process for the monopoly board game.