Founded in 1933, The Monorail Manufacturers Association, Inc. (MMA) is an independent incorporated trade association affiliated with the Material Handling Industry. MMA Members produce the preponderance of patented and enclosed track underhung cranes and monorail systems.

MMA operates through committees with programs and policies reviewed and adopted by the membership with representation from each member company. Its many activities include an active engineering committee. MMA is represented on a number of standards developing committees and actively supports the development and certification of safety standards by the ANSI consensus method.