Group 11 element Parkes process. These metals, especially silver, have unusual properties that make them essential for industrial applications outside of their monetary or decorative value. They are all excellent conductors of electricity. The most conductive of all metals are silver, copper and gold in that order. Silver is also the most thermally conductive element, and the most light reflecting element. Silver also has the unusual property that the tarnish that forms on silver is still highly electrically conductive. Copper is used extensively in electrical wiring and circuitry. Gold contacts are sometimes found in precision equipment for their ability to remain corrosion-free. Silver
Conductor (rail) to a train operator performing those duties. The conductor often stays in the center of the train where they can best view the platform. While advances in automation allow most transit systems to use "one person train operation" (OPTO), a few, such as the New York City Subway, Toronto Transit Commission and Sydney Trains continue to employ conductors. Conductor is also a crew member in some bus, trolleybus or tram operations. In North America, the conductor manages a freight, passenger, or other types of train, and directly supervises the train crew, which can include a brakeman, flagman, ticket collector, assistant