Red
Green
Yellow
White
Answer is Right!
Answer is Wrong!
The correct answer is: Red.
A derailing switch is a type of switch that is used to divert a train from its normal track onto a side track. The trap indicator is a device that is used to show the position of the derailing switch. When the derailing switch is closed, the trap indicator shows a red light by night and no target by day. This is to warn the train driver that the track is not clear and that they should not proceed.
The other options are incorrect because they do not accurately describe the color of the light that the trap indicator shows when the derailing switch is closed.
- Option A: Red. This is the correct answer.
- Option B: Green. The trap indicator does not show a green light when the derailing switch is closed.
- Option C: Yellow. The trap indicator does not show a yellow light when the derailing switch is closed.
- Option D: White. The trap indicator does not show a white light when the derailing switch is closed.