Photographs Gears Corine, John and Beth Gears are wheels with teeth. If you move one gear, the other one will also move. Gears are used in mining machines such as the gold dredge and the train. The gold dredge is a big machine that gets dirt out of the ground faster so the gold can be mined more quickly. The miners can pan out the rest of the pay dirt and get more gold.
Trains also have gears.
The train is how the miners got around or they used it when they move supplies.