US corresponds to which equipment function?

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Multiple Choice

US corresponds to which equipment function?

Explanation:
US is the designation used for a time element stick relay. In signaling systems, equipment function codes identify both the purpose and the type of device in the circuit. A time element provides a deliberate delay, and the “stick” aspect refers to the stick-type relay mechanism used in some time-delay devices. So US specifies this specific time-delay relay construction, distinguishing it from a generic time element relay, a train stop, or speed indicator light control, which are different functions.

US is the designation used for a time element stick relay. In signaling systems, equipment function codes identify both the purpose and the type of device in the circuit. A time element provides a deliberate delay, and the “stick” aspect refers to the stick-type relay mechanism used in some time-delay devices. So US specifies this specific time-delay relay construction, distinguishing it from a generic time element relay, a train stop, or speed indicator light control, which are different functions.

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