Signals - ATC

Question 1

What does ATC stand for?

Answer 1

Automatic and Track Control

Question 2

What happens when 2 or more trains are to proceed in the same direction through a Single Line Section on the ATC?

Answer 2

More than 1 train can’t be on a Track Section at the same time

(Fixed Signals are controlled by Track Circuits which protect the train in advance)

Question 3

How are trains prevented from entering a Single Line Section in opposing directions at the same time?

Answer 3

Once a Home Departure Signal has been placed to Proceed, the opposing Home Departure Signal is Electronically secured at STOP until the Section is clear

Question 4

When May drivers be asked to operate Dual Control Point Machines?

Answer 4

May be asked by Signaller or Train Controller at some remote-controlled crossing loops during Signal failures

(A competent worker may also be deployed to operate on behalf of the Signaller)

Question 5

What are Station Limits for ATC?

Answer 5

The portion of line between opposing Home Arrival Signals

Question 6

What authority is needed to enter the Single Line Section on the ATC?

Answer 6

• Proceed Aspect on a Home Departure Signal
  (Or Dwarf Signal in some locations if entering the ATC Single Line Section from a Siding)

Question 7

What is a Single Line Section on the ATC?

Answer 7

The portion of line between to 2 crossing loops (Station Limits)

Question 8

What is the Track Section?

Answer 8

Section of Track between 2 Fixed Signals

Question 9

How can Crossing Loops be controlled?

Answer 9

• Locally (Signal Box controlling points and signals)
• Remotely (Signaller at a different location controlling remotely)

Question 10

What are Home Arrival Signals?

Answer 10

Home Signals that control the entrance of trains into Crossing Loops (Station Limits)

(All Home Arrival Signals have “C” lights)

Question 11

What are Home Departure Signals?

Answer 11

Control the entrance of trains into the Single Line Section

(These are alway 3 Position Home Signals or Dwarf Signals)

Question 12

Can a Home Departure Signal have a Low Speed Caution aspects (“C” Light)?

Answer 12

Yes, for Shunting moves to a Siding or Low Speed movements towards another line that isn’t on the ATC

Question 13

What is the purpose of Intermediate Signals on the ATC?

Answer 13

• 3 Position Home Signals control and protect movements for Sidings and Junctions within the Single Line Section
• 3 Position Automatic Signals expedite the passage of trains to allow more frequent services running in the same direction