Which term refers to the appearance of a fixed signal indicating an indication as viewed from the direction of an approaching train?

• A. Interlocking (Int)
• B. Cab Signal Indicator
• C. Aspect
• D. Fixed Signal

Answer: (C)

This question is about what you call the visible indication a fixed signal shows to an approaching train. That visible message is called the aspect—the color and arrangement you see on the signal face, such as red meaning stop or green meaning proceed, with other aspects indicating caution or restrictions as appropriate.

Interlocking refers to the overall safety system that coordinates signals and track routes, not the specific signal’s appearance. Cab Signal Indicator is the device in the locomotive that shows cab signaling information, not what the fixed signal looks like from outside. A Fixed Signal is the actual signal device itself, the object, whereas the term asked for describes what the signal looks like to the train. So the correct term for the appearance of the fixed signal is aspect.