Which code is Red signal repeater relay?

• A. Rg
• B. Rgp
• C. Po
• D. Nwr

Answer: (B)

A Red signal repeater relay is a device used to duplicate the red signal indication at a remote location so the operator or interlocking can register the red aspect even when the actual signal isn’t in view. The code for that specific component is a shorthand label that electricians and maintainers use in diagrams and parts lists.

This code—Rgp—stands for Red signal repeater relay, signaling that the component’s function is to repeat the red aspect of a signal. That distinction matters because not all red-related devices are repeaters; some refer to the primary red signal element itself. The other codes correspond to different components or functions and do not describe the repeater role. So the best match for a Red signal repeater relay is the code that explicitly names that repeater function.