The US Monorail Manufacturers’ Association has published two of its published standards free on the Internet. They are the group’s Guidelines for Specifying Automated Electrified Monorail Systems, and Specifications for Patented Underhung Cranes and Monorail Systems, MH27.1-2003.
Both are available under the ‘publications’ page of the MMA’s web site. The MMA is part of umbrella trade group the Material Handling Industry of America (MHIA).