Element 4 Semaphore Signalling Questions Flashcards
What are the four types of Semaphore signals
Stop signals, Distant signals, Subsidiary Signals and Shunting signals
What does a Semaphore Stop signal look like?
Red Arm with White Vertical Stripe.
During daylight what is the “Off” indication of a Semaphore Stop signal?
Signal Arm raised to an angle of 45 degrees.
During darkness what indications does a Semaphore Stop signal show?
Red for Stop
Green for Proceed
If you observe a signal which is not shown or imperfectly shown what must you assume that the signal is showing?
A Stop Aspect.
What does a Semaphore Distant signal look like?
Yellow Fishtail Arm with a Black Chevron.
During daylight what is the “Clear” indication of a Distant Semaphore signal?
Signal Arm raised to an angle of 45 degrees.
During daylight what is the “Caution” indication of a Distant Semaphore signal?
Signal Arm maintained in a Horizontal position.
During darkness what are “Clear” and “Caution” indications of a Semaphore Distant signal?
Green light for “Clear”
Yellow light for “Caution”
If you observe a Distant signal which is not shown or imperfectly shown what must you assume that the signal is showing
A Caution Aspect.
What does a Semaphore Subsidiary signal look like?
Small Red Semaphore Arm with a White Horizontal Stripe, or a small Semaphore stops signal.
Where is a Semaphore Subsidiary signal normally placed?
Below the Main Stop signal.
During daylight when a Semaphore Subsidiary signal is cleared what is the indication?
The Signal Arm raised at 45 degrees.
During darkness what are the “Stop” and “Proceed” indications of a Semaphore Subsidiary signal?
Red light for “Stop”
Green light for “Proceed”
What does the clearing of a Semaphore Subsidiary signal indicate?
Proceed past the Main Stop signal for shunting purposes, being prepared to stop short of any obstructions, or at the next Stop signal.
What does a Semaphore Shunting signal look like?
A White Disk with a Red Horizontal Bar, or a short red arm on a post.
During daylight what is the Proceed indication of Semaphore Shunting signal?
Disk (including Red Horizontal Bar) at an angle of 45 degrees, or arm raised at 45 degrees.
During darkness what are the “Stop” and “Proceed” indications of a Semaphore Shunting signal?
Red light for “Stop”
Green light for “Proceed.
How would you identify an Intermediate Block signal?
A White Signal Post Plate with a Black Vertical Stripe.
In an Absolute Block Signalling area whom controls an Intermediate Block Home signal?
The Signal Box in rear.
In an Absolute Block Signalling area what is meant by the term Intermediate Block Section?
The Intermediate Block Section is the portion of line between the Section Signal and the Intermediate Block Signal controlled by the same signal box.
In an Absolute Block Signalling area what is meant by the term Braking Distance?
The Braking Distance is the line between the Distant Signal and the Home (Stop) Signal belonging to the same signal box.
In an Absolute Block Signalling area what is meant by the term Station Limits?
Station Limits is the portion of line between the Home Signal and the Section Signal controlled by the same signal box.
In an Absolute Block Signalling area what is meant by the term Block Section?
The Block Section is the portion of line between the Section Signal of the Signal Box in rear to the Home Signal of the signal box in advance.
