Signals and Their Indications Flashcards
6 cards from real GCOR practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Signals and Their Indications flashcards as text
According to GCOR, what is the indication for a signal displaying a single yellow light, known as an 'Approach' signal?
Answer: Proceed prepared to stop at the next signal. Trains exceeding 30 MPH must immediately reduce to that speed.
The 'Approach' signal indication requires the train to be operated in a manner that allows it to be stopped before the next signal. It also imposes an immediate speed reduction for trains traveling faster than a specified speed (often 30 or 40 MPH, depending on the railroad's special instructions, but the core instruction is to prepare to stop).
A train crew encounters a signal displaying a single red light. Under GCOR, what is the primary indication of this 'Stop' signal?
Answer: Stop before any part of the train passes the signal and do not proceed without authority.
A signal displaying a solid red light indicates 'Stop'. A train must stop before any part of it passes the signal mast. The train may not proceed until authorized by the control operator or as otherwise specified in the rules (e.g., under a track permit).
While operating in signaled territory, your train passes a signal displaying a flashing yellow aspect. What is the name and indication of this signal?
Answer: Approach Restricting: Proceed prepared to pass the next signal at restricted speed.
A flashing yellow aspect is an 'Approach Restricting' signal. The indication is to proceed prepared to pass the next signal at restricted speed. This tells the engineer that the block ahead is clear, but the next signal will require them to enter a block under restricted speed conditions.
A train is authorized to pass a signal displaying a 'Restricting' indication. Which of the following is a key requirement for the train's movement?
Answer: The movement must be able to stop within half the range of vision, short of any obstruction, and not exceeding 20 MPH.
A 'Restricting' indication requires movement at restricted speed. GCOR defines restricted speed as a speed that allows stopping within one-half the range of vision, short of a train, engine, railroad car, stop signal, misaligned switch, or broken rail, not to exceed 20 MPH.
Your train is approaching an interlocking and the governing signal displays a red over green aspect. What action should you take?
Answer: Proceed on the diverging route at the prescribed speed through the turnout.
A red over green aspect is a 'Diverging Clear' signal. It indicates that the route is lined for a diverging movement and the train may proceed through the turnout at the speed specified in the timetable or special instructions. The track beyond the interlocking is clear.
According to GCOR Rule 9.4, if a block signal light is absent or a white light is displayed where a colored light should be, how must the signal be regarded?
Answer: As displaying its most restrictive indication.
GCOR Rule 9.4 states that if a light is absent, improperly displayed, or a white light appears where a color should be, the signal must be regarded as displaying its most restrictive indication (typically 'Stop'). The only exception is if a semaphore arm's position is plainly visible, in which case the arm's aspect governs.