The Louden Monorail System in the Auto Repair Shop, also known as McGuire Motor Company and Crandall's Electric Service, is a historic structure located in Fairfield, Iowa, United States.

It is the rear, single-story, portion of the building at 117 E. Broadway Ave where the system is located.

Harley Carter bought this building in 1920, and had the monorail system, manufactured by the Louden Machinery Company, installed about 1922.

The overhead material handling system is permanently attached to the east wall of the shop.

This article about a property in Jefferson County, Iowa on the National Register of Historic Places is a stub.