SimEx-Iwerks Entertainment (stylized as simEx ! Iwerks; formerly Iwerks Entertainment) is an entertainment company specialising in 3-D/4-D films and theatres, as well as motion simulator rides. The company was founded in 1985 by Don Iwerks (son of Ub Iwerks, animator and former business partner of Walt Disney) and Stan Kinsey.

They produced the 4-D elements of Thomas & Friends in 4-D: Bubbling Boilers.

They have three production facilities in North America: Los Angeles, California and Baltimore, Maryland in the United States and Toronto, Ontario in Canada.

“Welcome to the Steamworks, my friend!”
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