Much of the asbestos exposures experienced by railroad workers in Michigan occurred in what was known as Roundhouses. Throughout the state of Michigan, roundhouses were locations where train cars were serviced, maintained, and repaired beginning in the late 19th century.
The types of asbestos products that railroad workers were exposed to changed significantly when diesel engines replaced steam in the mid-20th century. The use of Roundhouses for repair and maintenance continued throughout the 20th century. A few are still in use today.