Some of the physical activities performed by Track Equipment Maintainers and the environmental conditions they experience are crawling under trucks and heavy equipment; working in confined spaces; working on subway and elevated tracks; lifting and carrying heavy tools and components; taking precise measurements; distinguishing colors; manually removing and installing parts and bolts in confined areas; moving out of the way of moving vehicles and heavy equipment, including trains while working on or near tracks that are in service; hearing warnings (verbal, horns, bells, and signals); and working outdoors in all weather conditions. Two years of full-time satisfactory journey-level mechanic experience (i.e., fully trained, proficient, knowledgeable, experienced and competent) in the testing, operation, maintenance, alteration and repair of the mechanical, electrical, hydraulic, and pneumatic components and systems of (A) Heavy equipment of the type used in construction or the maintenance and repair of track, such as pneumatic and hydraulic compressors, drills, pile drivers, payloaders, tractors and conveyors, including gasoline and diesel engines; or (B) Transportation vehicles such as passenger automobiles, trucks, buses, marine vessels, or aircraft.