Meet the WheelHouse staff at booth 646 pf the Inland Marine Expo being held in The Dome at America’ s Center, St. Louis, Missouri May 22-24th. IMX is the annual trade show for the inland and intracoastal marine transportation industry. At the show, you will find equipment and services that are critical in the transportation of goods along U.S. inland and intracoastal waterways. The inland marine transportation industry is composed of more than 25,000 barges, 3,700 towboats and tugs, and 12,000 miles of waterways with docks, fleets and repair facilities. It is the largest (by vessel), most active (by number of vessels built) and most diverse sector of the U.S. commercial marine industry.