Operate dredge to remove sand, gravel, or other materials in order to excavate and maintain navigable channels in waterways.

Operate and watch over bridges, canal locks, and lighthouses to permit marine passage on inland waterways, near shores, and at danger points in waterway passages. They supervise such operations. Includes drawbridge operators, lock operators, and slip bridge operators.

Coordinate activities of switch engine crew within railroad yard, industrial plant, or similar location. They coordinate activities of train crew on passenger or shipment trains. They review train schedules and switching orders and coordinate activities of workers engaged in railroad traffic operations, such as the makeup or breakup of trains and yard switching.

Directly supervise and coordinate the activities of helpers, laborers, or material movers.

Operate or watch over machines to prepare industrial or consumer products for storage or shipment. Includes cannery workers who pack food products.

Work as part of a team having responsibility for assembling an entire product or component of a product. They can perform all tasks conducted by the team in the assembly process and rotate through all or most of them. They participate in making management decisions affecting the work. Includes team leaders who work as part of the team.

Move or install mobile homes or prefabricated buildings.

Assemble or repair oil field equipment using hand and power tools. They perform other tasks as needed.

Operate machinery to install roof support bolts in underground mine.

Operate machinery such as longwall shears, plows, and cutting machines. They cut or channel along the face or seams of coal mines, stone quarries, or other mining surfaces. They facilitate blasting, separating, or removing minerals or materials from mines or from the surface. Includes shale planers.