Some of the physical activities performed by Electronic Equipment Maintainers and environmental conditions they experience are: climbing ladders, distinguishing colors to troubleshoot complex equipment, accurately distinguishing shapes under poorly lit working conditions, moving out of the way of moving trains and motor vehicles, working on or near tracks having live 600-volt contact rails, walking along the track in dimly lit areas, loading and unloading vehicles and working outdoors in all weather conditions. Electronic Equipment Maintainers, under supervision, maintain, install, inspect, test, alter and repair electronic wireless and wired communication systems, and digital and analog control equipment and systems in the shop or in the field, including radio systems, closed circuit video equipment, and other electronic communication equipment; perform circuit testing, analysis, and fault identification; keep records; operate motor vehicles; and perform related work.