Anyone working in a cold environment may be at risk of cold stress. Some workers may be required to work outdoors in cold environments and for extended periods, railroad workers can be especially effected by this. Cold stress can be encountered in these types of work environment. These releases and frequently asked questions will help workers understand what cold stress is, how it may affect their health and safety, and how it can be prevented.
Here is a link to the American Association of Railroads.
Here is the FAQ from OSHA.