MV Mark W. Barker is a large diesel-powered lake freighter owned and operated by the Interlake Steamship Company.

[2][3] MV Mark W. Barker is the first ship on the Great Lakes to be powered with engines that meet EPA Tier 4 standards.

[8] The ship is 639 feet (195 m) long and has a 78-foot (24 m) beam, with a carrying capacity of 26,000 tons deadweight (DWT).

[9][10] She is designed to carry bulk cargo such as taconite, salt, or limestone, as well as other loads like wind turbine blades.

[1][11] MV Mark W. Barker is powered by two 4,000-horsepower (3,000 kW), 16-cylinder EMD diesel engines.