Backpoling of trolleys is prohibited except where there is inadequate
clearance to reverse the trolley pole. Where backpoling is required, it shall
be done only at the minimum tram speed of the trolley.
U.S. Department of Labor | Mine Safety and Health Administration (MSHA) | 1100 Wilson Boulevard, 21st Floor | Arlington, VA 22209-3939 www.msha.gov | Telephone: (202) 693-9400 | Fax-on-demand: (202) 693-9401