Subway operators complain about the confined space, uncomfortable seats and exposure to vibration, which suggests that the ergonomic constraints and vibration pose health risks, particularly musculoskeletal disorders. Related to an ergonomic study, this project defined the vibrational stresses to which these workers are exposed, characterized the vibration environment of the cars, identified the operational factors likely to influence whole-body vibration exposure levels, and finally, led to the development of seat suspension design criteria for reducing vibration. Significant levels of recorded vibrations for some interstations indicate that efforts to reduce their intensity should be considered. The report describes the requirements relating to the natural frequency and damping characteristics of the seats that could be considered effective in reducing these vibrations, as well as other solutions that could be considered as complementary.