An ore boat that appears to have turned around on Lake Superior after leaving the port of Duluth-Superior earlier this week was brought in for repairs, its company said Thursday.

The Cason J. Callaway was moored for repairs at Fraser Shipyards in Superior on Wednesday. As of Thursday morning, the freighter was already working again and loading in Two Harbors.

The plight of the Cason J. Callaway left boat watchers wondering what had happened to the vessel, ending up at the shipyard in Howards Bay on Wednesday.

"The Callaway needed some planned minor repairs," CN spokesman Alexandre Boulé told the News Tribune.

One of the Great Lakes Fleet of boats, the Callaway is owned by Canadian National Railway. Callaway was built in the early 1950s, along with the Arthur M. Anderson and Philip R. Clarke — all Great Lakes Fleet boats and identical 767-footers.

CN would not confirm a marinetraffic.com tracking function, which showed the Callaway leaving port this week through the Duluth shipping canal, only to turn around on Lake Superior and retreat to Fraser Shipyards. The Callaway joined the retired attraction boat William A. Irvin at the shipyard, where the Irvin is in dry dock for painting and other repairs.

The Great Lakes Fleet of lake freighters is home-based in Duluth and operated by Key Lakes, Inc. — an American company which functions to allow Canadian ownership of the fleet.

The Jones Act provides that no merchandise transported by water between U.S. ports is to be carried “in any other vessel than a vessel built and documented under the laws of the United States, crewed by Americans, and owned by persons who are citizens of the United States.”