Iron produced at Zug Island is transported in bottle cars via rail to steelmaking at the main plant while DTE's coke is shipped via rail to supply consumers, chiefly ISG/Mittal, in the merchant metallurgical market. During the industry's peak, thousands of workers were employed on the island with a large percentage of the downriver community supported by the local steel producer. Today a few hundred people work on the island with the hourly workers at U.S. Steel represented by United Steelworkers Local 1299. In fall of 2008 U.S. Steel halted its production due to the economic downturn, but restarted its production in fall of 2009.